diff --git a/examples/joystick/Joystick.cpp b/examples/joystick/Joystick.cpp
index 6e1de3d04..06367742a 100644
--- a/examples/joystick/Joystick.cpp
+++ b/examples/joystick/Joystick.cpp
@@ -5,7 +5,6 @@
 #include <SFML/Graphics.hpp>
 #include <algorithm>
 #include <sstream>
-#include <iomanip>
 #include <string>
 #include <unordered_map>
 
diff --git a/examples/voip/Server.cpp b/examples/voip/Server.cpp
index 32ca10302..9012c77bd 100644
--- a/examples/voip/Server.cpp
+++ b/examples/voip/Server.cpp
@@ -5,7 +5,6 @@
 #include <SFML/Audio.hpp>
 #include <SFML/Network.hpp>
 #include <cstring>
-#include <iomanip>
 #include <iostream>
 #include <iterator>
 #include <mutex>
diff --git a/examples/voip/VoIP.cpp b/examples/voip/VoIP.cpp
index 06c37b743..1bf6b0921 100644
--- a/examples/voip/VoIP.cpp
+++ b/examples/voip/VoIP.cpp
@@ -2,7 +2,6 @@
 ////////////////////////////////////////////////////////////
 // Headers
 ////////////////////////////////////////////////////////////
-#include <iomanip>
 #include <iostream>
 #include <cstdlib>
 
diff --git a/extlibs/headers/glad/include/glad/wgl.h b/extlibs/headers/glad/include/glad/wgl.h
index 2c443ac84..a23c72e40 100644
--- a/extlibs/headers/glad/include/glad/wgl.h
+++ b/extlibs/headers/glad/include/glad/wgl.h
@@ -28,7 +28,7 @@
 #ifndef SF_GLAD_WGL_H_
 #define SF_GLAD_WGL_H_
 
-#include <windows.h>
+#include <SFML/System/Win32/WindowsHeader.hpp>
 #include <glad/gl.h>
 
 #define SF_GLAD_WGL
diff --git a/include/SFML/Audio/SoundFileReader.hpp b/include/SFML/Audio/SoundFileReader.hpp
index 9a8804a89..116b60e18 100644
--- a/include/SFML/Audio/SoundFileReader.hpp
+++ b/include/SFML/Audio/SoundFileReader.hpp
@@ -29,7 +29,6 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Audio/Export.hpp>
-#include <string>
 
 
 namespace sf
diff --git a/include/SFML/Graphics/RenderWindow.hpp b/include/SFML/Graphics/RenderWindow.hpp
index 0c7bdab7e..3fc6c543d 100644
--- a/include/SFML/Graphics/RenderWindow.hpp
+++ b/include/SFML/Graphics/RenderWindow.hpp
@@ -32,7 +32,6 @@
 #include <SFML/Graphics/RenderTarget.hpp>
 #include <SFML/Graphics/Image.hpp>
 #include <SFML/Window/Window.hpp>
-#include <string>
 
 
 namespace sf
diff --git a/include/SFML/Network/IpAddress.hpp b/include/SFML/Network/IpAddress.hpp
index 7ce593059..478847b4b 100644
--- a/include/SFML/Network/IpAddress.hpp
+++ b/include/SFML/Network/IpAddress.hpp
@@ -30,8 +30,7 @@
 ////////////////////////////////////////////////////////////
 #include <SFML/Network/Export.hpp>
 #include <SFML/System/Time.hpp>
-#include <istream>
-#include <ostream>
+#include <iosfwd>
 #include <string>
 
 
diff --git a/include/SFML/System/Utf.hpp b/include/SFML/System/Utf.hpp
index 8b94b9aac..240642501 100644
--- a/include/SFML/System/Utf.hpp
+++ b/include/SFML/System/Utf.hpp
@@ -29,7 +29,6 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Config.hpp>
-#include <algorithm>
 #include <locale>
 #include <string>
 #include <cstdlib>
@@ -37,6 +36,12 @@
 
 namespace sf
 {
+namespace priv
+{
+    template<class InputIt, class OutputIt>
+    OutputIt copy(InputIt first, InputIt last, OutputIt d_first);
+}
+
 template <unsigned int N>
 class Utf;
 
diff --git a/include/SFML/System/Utf.inl b/include/SFML/System/Utf.inl
index 8bd2ea10d..360cea9c9 100644
--- a/include/SFML/System/Utf.inl
+++ b/include/SFML/System/Utf.inl
@@ -35,6 +35,15 @@
 
 
 ////////////////////////////////////////////////////////////
+template <typename InputIt, typename OutputIt>
+OutputIt priv::copy(InputIt first, InputIt last, OutputIt d_first)
+{
+    while (first != last)
+        *d_first++ = *first++;
+
+    return d_first;
+}
+
 template <typename In>
 In Utf<8>::decode(In begin, In end, Uint32& output, Uint32 replacement)
 {
@@ -121,7 +130,7 @@ Out Utf<8>::encode(Uint32 input, Out output, Uint8 replacement)
         }
 
         // Add them to the output
-        output = std::copy(bytes, bytes + bytestoWrite, output);
+        output = priv::copy(bytes, bytes + bytestoWrite, output);
     }
 
     return output;
@@ -244,7 +253,7 @@ Out Utf<8>::toLatin1(In begin, In end, Out output, char replacement)
 template <typename In, typename Out>
 Out Utf<8>::toUtf8(In begin, In end, Out output)
 {
-    return std::copy(begin, end, output);
+    return priv::copy(begin, end, output);
 }
 
 
@@ -413,7 +422,7 @@ Out Utf<16>::fromLatin1(In begin, In end, Out output)
 {
     // Latin-1 is directly compatible with Unicode encodings,
     // and can thus be treated as (a sub-range of) UTF-32
-    return std::copy(begin, end, output);
+    return priv::copy(begin, end, output);
 }
 
 
@@ -482,7 +491,7 @@ Out Utf<16>::toUtf8(In begin, In end, Out output)
 template <typename In, typename Out>
 Out Utf<16>::toUtf16(In begin, In end, Out output)
 {
-    return std::copy(begin, end, output);
+    return priv::copy(begin, end, output);
 }
 
 
@@ -563,7 +572,7 @@ Out Utf<32>::fromLatin1(In begin, In end, Out output)
 {
     // Latin-1 is directly compatible with Unicode encodings,
     // and can thus be treated as (a sub-range of) UTF-32
-    return std::copy(begin, end, output);
+    return priv::copy(begin, end, output);
 }
 
 
@@ -630,7 +639,7 @@ Out Utf<32>::toUtf16(In begin, In end, Out output)
 template <typename In, typename Out>
 Out Utf<32>::toUtf32(In begin, In end, Out output)
 {
-    return std::copy(begin, end, output);
+    return priv::copy(begin, end, output);
 }
 
 
diff --git a/include/SFML/Window/Clipboard.hpp b/include/SFML/Window/Clipboard.hpp
index cacf2a8ca..697ecf9c5 100644
--- a/include/SFML/Window/Clipboard.hpp
+++ b/include/SFML/Window/Clipboard.hpp
@@ -29,11 +29,12 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Window/Export.hpp>
-#include <SFML/System/String.hpp>
 
 
 namespace sf
 {
+class String;
+
 ////////////////////////////////////////////////////////////
 /// \brief Give access to the system clipboard
 ///
diff --git a/include/SFML/Window/WindowBase.hpp b/include/SFML/Window/WindowBase.hpp
index 72dbe5579..9702537a9 100644
--- a/include/SFML/Window/WindowBase.hpp
+++ b/include/SFML/Window/WindowBase.hpp
@@ -35,12 +35,13 @@
 #include <SFML/Window/WindowHandle.hpp>
 #include <SFML/Window/WindowStyle.hpp>
 #include <SFML/System/Clock.hpp>
-#include <SFML/System/String.hpp>
 #include <SFML/System/Vector2.hpp>
 
 
 namespace sf
 {
+class String;
+
 namespace priv
 {
     class WindowImpl;
diff --git a/src/SFML/Audio/AudioDevice.hpp b/src/SFML/Audio/AudioDevice.hpp
index 04a156226..4af32dda5 100644
--- a/src/SFML/Audio/AudioDevice.hpp
+++ b/src/SFML/Audio/AudioDevice.hpp
@@ -29,7 +29,6 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/System/Vector3.hpp>
-#include <set>
 #include <string>
 
 
diff --git a/src/SFML/Audio/SoundFileReaderFlac.hpp b/src/SFML/Audio/SoundFileReaderFlac.hpp
index ee0af6436..c33d8d622 100644
--- a/src/SFML/Audio/SoundFileReaderFlac.hpp
+++ b/src/SFML/Audio/SoundFileReaderFlac.hpp
@@ -30,7 +30,6 @@
 ////////////////////////////////////////////////////////////
 #include <SFML/Audio/SoundFileReader.hpp>
 #include <FLAC/stream_decoder.h>
-#include <string>
 #include <vector>
 
 
diff --git a/src/SFML/Audio/SoundFileReaderOgg.cpp b/src/SFML/Audio/SoundFileReaderOgg.cpp
index 84d6c228a..99ff963de 100644
--- a/src/SFML/Audio/SoundFileReaderOgg.cpp
+++ b/src/SFML/Audio/SoundFileReaderOgg.cpp
@@ -28,7 +28,6 @@
 #include <SFML/Audio/SoundFileReaderOgg.hpp>
 #include <SFML/System/MemoryInputStream.hpp>
 #include <SFML/System/Err.hpp>
-#include <algorithm>
 #include <cctype>
 #include <cassert>
 
diff --git a/src/SFML/Audio/SoundFileReaderWav.hpp b/src/SFML/Audio/SoundFileReaderWav.hpp
index b25342591..4fc7ead7e 100644
--- a/src/SFML/Audio/SoundFileReaderWav.hpp
+++ b/src/SFML/Audio/SoundFileReaderWav.hpp
@@ -29,7 +29,6 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Audio/SoundFileReader.hpp>
-#include <string>
 
 
 namespace sf
diff --git a/src/SFML/Graphics/Text.cpp b/src/SFML/Graphics/Text.cpp
index bd125840b..7b5141412 100644
--- a/src/SFML/Graphics/Text.cpp
+++ b/src/SFML/Graphics/Text.cpp
@@ -28,6 +28,7 @@
 #include <SFML/Graphics/Text.hpp>
 #include <SFML/Graphics/Texture.hpp>
 #include <SFML/Graphics/RenderTarget.hpp>
+#include <algorithm>
 #include <cmath>
 
 
diff --git a/src/SFML/Network/Http.cpp b/src/SFML/Network/Http.cpp
index f6c2ff4e1..739e51e05 100644
--- a/src/SFML/Network/Http.cpp
+++ b/src/SFML/Network/Http.cpp
@@ -28,7 +28,6 @@
 #include <SFML/Network/Http.hpp>
 #include <SFML/System/Err.hpp>
 #include <cctype>
-#include <algorithm>
 #include <iterator>
 #include <sstream>
 #include <limits>
@@ -204,7 +203,7 @@ void Http::Response::parse(const std::string& data)
     {
         if ((version.size() >= 8) && (version[6] == '.') &&
             (toLower(version.substr(0, 5)) == "http/")   &&
-             isdigit(version[5]) && isdigit(version[7]))
+             std::isdigit(version[5]) && std::isdigit(version[7]))
         {
             m_majorVersion = static_cast<unsigned int>(version[5] - '0');
             m_minorVersion = static_cast<unsigned int>(version[7] - '0');
diff --git a/src/SFML/Network/IpAddress.cpp b/src/SFML/Network/IpAddress.cpp
index 90d9e24d9..5c07179b5 100644
--- a/src/SFML/Network/IpAddress.cpp
+++ b/src/SFML/Network/IpAddress.cpp
@@ -28,6 +28,8 @@
 #include <SFML/Network/IpAddress.hpp>
 #include <SFML/Network/Http.hpp>
 #include <SFML/Network/SocketImpl.hpp>
+#include <istream>
+#include <ostream>
 #include <cstring>
 #include <utility>
 
diff --git a/src/SFML/Network/UdpSocket.cpp b/src/SFML/Network/UdpSocket.cpp
index 012f68779..40c8de62b 100644
--- a/src/SFML/Network/UdpSocket.cpp
+++ b/src/SFML/Network/UdpSocket.cpp
@@ -30,7 +30,7 @@
 #include <SFML/Network/Packet.hpp>
 #include <SFML/Network/SocketImpl.hpp>
 #include <SFML/System/Err.hpp>
-#include <algorithm>
+#include <cstddef>
 
 
 namespace sf
diff --git a/src/SFML/System/Err.cpp b/src/SFML/System/Err.cpp
index df371fe5e..a1bd30572 100644
--- a/src/SFML/System/Err.cpp
+++ b/src/SFML/System/Err.cpp
@@ -26,6 +26,7 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/System/Err.hpp>
+#include <iostream>
 #include <streambuf>
 #include <cstdio>
 
diff --git a/src/SFML/Window/Android/ClipboardImpl.cpp b/src/SFML/Window/Android/ClipboardImpl.cpp
index 5aceb0e7a..a82cba089 100644
--- a/src/SFML/Window/Android/ClipboardImpl.cpp
+++ b/src/SFML/Window/Android/ClipboardImpl.cpp
@@ -27,6 +27,7 @@
 ////////////////////////////////////////////////////////////
 #include <SFML/Window/Android/ClipboardImpl.hpp>
 #include <SFML/System/Err.hpp>
+#include <SFML/System/String.hpp>
 
 
 namespace sf
diff --git a/src/SFML/Window/Android/ClipboardImpl.hpp b/src/SFML/Window/Android/ClipboardImpl.hpp
index f657ccb9f..92c1f3585 100644
--- a/src/SFML/Window/Android/ClipboardImpl.hpp
+++ b/src/SFML/Window/Android/ClipboardImpl.hpp
@@ -25,14 +25,11 @@
 #ifndef SFML_CLIPBOARDIMPLANDROID_HPP
 #define SFML_CLIPBOARDIMPLANDROID_HPP
 
-////////////////////////////////////////////////////////////
-// Headers
-////////////////////////////////////////////////////////////
-#include <SFML/System/String.hpp>
-
 
 namespace sf
 {
+class String;
+
 namespace priv
 {
 ////////////////////////////////////////////////////////////
diff --git a/src/SFML/Window/EGLCheck.cpp b/src/SFML/Window/EGLCheck.cpp
index a5a4735f6..8c5a659ac 100644
--- a/src/SFML/Window/EGLCheck.cpp
+++ b/src/SFML/Window/EGLCheck.cpp
@@ -29,6 +29,7 @@
 #include <SFML/Window/EGLCheck.hpp>
 #include <SFML/System/Err.hpp>
 #include <glad/egl.h>
+#include <string>
 
 
 namespace sf
diff --git a/src/SFML/Window/EGLCheck.hpp b/src/SFML/Window/EGLCheck.hpp
index 8eb6d0a22..367d3b70a 100644
--- a/src/SFML/Window/EGLCheck.hpp
+++ b/src/SFML/Window/EGLCheck.hpp
@@ -29,7 +29,6 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Config.hpp>
-#include <string>
 
 
 namespace sf
diff --git a/src/SFML/Window/OSX/ClipboardImpl.hpp b/src/SFML/Window/OSX/ClipboardImpl.hpp
index fa6987fbb..cfb695cf4 100644
--- a/src/SFML/Window/OSX/ClipboardImpl.hpp
+++ b/src/SFML/Window/OSX/ClipboardImpl.hpp
@@ -25,14 +25,11 @@
 #ifndef SFML_CLIPBOARDIMPLCOCOA_HPP
 #define SFML_CLIPBOARDIMPLCOCOA_HPP
 
-////////////////////////////////////////////////////////////
-// Headers
-////////////////////////////////////////////////////////////
-#include <SFML/System/String.hpp>
-
 
 namespace sf
 {
+class String;
+
 namespace priv
 {
 
diff --git a/src/SFML/Window/OSX/ClipboardImpl.mm b/src/SFML/Window/OSX/ClipboardImpl.mm
index 858e35ace..2d4a56c02 100644
--- a/src/SFML/Window/OSX/ClipboardImpl.mm
+++ b/src/SFML/Window/OSX/ClipboardImpl.mm
@@ -27,6 +27,7 @@
 ////////////////////////////////////////////////////////////
 #include <SFML/Window/OSX/AutoreleasePoolWrapper.hpp>
 #include <SFML/Window/OSX/ClipboardImpl.hpp>
+#include <SFML/System/String.hpp>
 
 #import <AppKit/AppKit.h>
 
diff --git a/src/SFML/Window/OSX/JoystickImpl.hpp b/src/SFML/Window/OSX/JoystickImpl.hpp
index b640769ff..cef5faa9c 100644
--- a/src/SFML/Window/OSX/JoystickImpl.hpp
+++ b/src/SFML/Window/OSX/JoystickImpl.hpp
@@ -30,7 +30,6 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Window/JoystickImpl.hpp>
-#include <SFML/System/String.hpp>
 #include <CoreFoundation/CoreFoundation.h>
 #include <IOKit/hid/IOHIDDevice.h>
 #include <IOKit/hid/IOHIDKeys.h>
diff --git a/src/SFML/Window/OSX/WindowImplCocoa.hpp b/src/SFML/Window/OSX/WindowImplCocoa.hpp
index 1662f512e..028147ee0 100644
--- a/src/SFML/Window/OSX/WindowImplCocoa.hpp
+++ b/src/SFML/Window/OSX/WindowImplCocoa.hpp
@@ -31,7 +31,6 @@
 ////////////////////////////////////////////////////////////
 #include <SFML/Window/Event.hpp>
 #include <SFML/Window/WindowImpl.hpp>
-#include <SFML/System/String.hpp>
 
 ////////////////////////////////////////////////////////////
 /// Predefine OBJ-C classes
@@ -55,6 +54,8 @@ using NSOpenGLContextRef = void*;
 
 namespace sf
 {
+class String;
+
 namespace priv
 {
 ////////////////////////////////////////////////////////////
diff --git a/src/SFML/Window/OSX/WindowImplCocoa.mm b/src/SFML/Window/OSX/WindowImplCocoa.mm
index 6cbc27365..4e6ef1d81 100644
--- a/src/SFML/Window/OSX/WindowImplCocoa.mm
+++ b/src/SFML/Window/OSX/WindowImplCocoa.mm
@@ -29,6 +29,7 @@
 #include <SFML/Window/OSX/AutoreleasePoolWrapper.hpp>
 #include <SFML/Window/OSX/WindowImplCocoa.hpp>
 #include <SFML/System/Err.hpp>
+#include <SFML/System/String.hpp>
 
 #import <SFML/Window/OSX/cpp_objc_conversion.h>
 #import <SFML/Window/OSX/Scaling.h>
diff --git a/src/SFML/Window/Unix/WindowImplX11.cpp b/src/SFML/Window/Unix/WindowImplX11.cpp
index 7da831c48..196bbfe5d 100644
--- a/src/SFML/Window/Unix/WindowImplX11.cpp
+++ b/src/SFML/Window/Unix/WindowImplX11.cpp
@@ -29,6 +29,7 @@
 #include <SFML/Window/Unix/ClipboardImpl.hpp>
 #include <SFML/Window/Unix/Display.hpp>
 #include <SFML/Window/Unix/InputImpl.hpp>
+#include <SFML/System/String.hpp>
 #include <SFML/System/Utf.hpp>
 #include <SFML/System/Err.hpp>
 #include <SFML/System/Sleep.hpp>
diff --git a/src/SFML/Window/Unix/WindowImplX11.hpp b/src/SFML/Window/Unix/WindowImplX11.hpp
index 1af56ab6c..7ae189f93 100644
--- a/src/SFML/Window/Unix/WindowImplX11.hpp
+++ b/src/SFML/Window/Unix/WindowImplX11.hpp
@@ -30,7 +30,6 @@
 ////////////////////////////////////////////////////////////
 #include <SFML/Window/Event.hpp>
 #include <SFML/Window/WindowImpl.hpp>
-#include <SFML/System/String.hpp>
 #include <SFML/Window/WindowStyle.hpp> // Prevent conflict with macro None from Xlib
 #include <X11/Xlib.h>
 #include <deque>
diff --git a/src/SFML/Window/Win32/ClipboardImpl.hpp b/src/SFML/Window/Win32/ClipboardImpl.hpp
index a7f63995e..58a3dfae9 100644
--- a/src/SFML/Window/Win32/ClipboardImpl.hpp
+++ b/src/SFML/Window/Win32/ClipboardImpl.hpp
@@ -25,14 +25,11 @@
 #ifndef SFML_CLIPBOARDIMPLWIN32_HPP
 #define SFML_CLIPBOARDIMPLWIN32_HPP
 
-////////////////////////////////////////////////////////////
-// Headers
-////////////////////////////////////////////////////////////
-#include <SFML/System/String.hpp>
-
 
 namespace sf
 {
+class String;
+
 namespace priv
 {
 ////////////////////////////////////////////////////////////
diff --git a/src/SFML/Window/Win32/JoystickImpl.cpp b/src/SFML/Window/Win32/JoystickImpl.cpp
index c447bf192..074399429 100644
--- a/src/SFML/Window/Win32/JoystickImpl.cpp
+++ b/src/SFML/Window/Win32/JoystickImpl.cpp
@@ -31,7 +31,6 @@
 #include <SFML/System/Err.hpp>
 #include <tchar.h>
 #include <regstr.h>
-#include <algorithm>
 #include <cmath>
 #include <cstring>
 #include <sstream>
diff --git a/src/SFML/Window/Win32/WindowImplWin32.cpp b/src/SFML/Window/Win32/WindowImplWin32.cpp
index f16f20cab..921abe776 100755
--- a/src/SFML/Window/Win32/WindowImplWin32.cpp
+++ b/src/SFML/Window/Win32/WindowImplWin32.cpp
@@ -29,6 +29,7 @@
 #include <SFML/Window/WindowStyle.hpp>
 #include <SFML/Window/JoystickImpl.hpp>
 #include <SFML/System/Err.hpp>
+#include <SFML/System/String.hpp>
 #include <SFML/System/Utf.hpp>
 // dbt.h is lowercase here, as a cross-compile on linux with mingw-w64
 // expects lowercase, and a native compile on windows, whether via msvc
diff --git a/src/SFML/Window/Win32/WindowImplWin32.hpp b/src/SFML/Window/Win32/WindowImplWin32.hpp
index 978871a5c..46e5fd386 100755
--- a/src/SFML/Window/Win32/WindowImplWin32.hpp
+++ b/src/SFML/Window/Win32/WindowImplWin32.hpp
@@ -31,11 +31,12 @@
 #include <SFML/Window/Event.hpp>
 #include <SFML/Window/WindowImpl.hpp>
 #include <SFML/System/Win32/WindowsHeader.hpp>
-#include <SFML/System/String.hpp>
 
 
 namespace sf
 {
+class String;
+
 namespace priv
 {
 ////////////////////////////////////////////////////////////
diff --git a/src/SFML/Window/WindowImpl.hpp b/src/SFML/Window/WindowImpl.hpp
index c3d4a1977..469dfe530 100644
--- a/src/SFML/Window/WindowImpl.hpp
+++ b/src/SFML/Window/WindowImpl.hpp
@@ -29,7 +29,6 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Config.hpp>
-#include <SFML/System/String.hpp>
 #include <SFML/Window/ContextSettings.hpp>
 #include <SFML/Window/CursorImpl.hpp>
 #include <SFML/Window/Event.hpp>
@@ -37,13 +36,14 @@
 #include <SFML/Window/Sensor.hpp>
 #include <SFML/Window/SensorImpl.hpp>
 #include <SFML/Window/VideoMode.hpp>
+#include <SFML/Window/Vulkan.hpp>
 #include <SFML/Window/WindowHandle.hpp>
-#include <SFML/Window/Window.hpp>
 #include <queue>
 #include <set>
 
 namespace sf
 {
+class String;
 class WindowListener;
 
 namespace priv
diff --git a/src/SFML/Window/iOS/ClipboardImpl.hpp b/src/SFML/Window/iOS/ClipboardImpl.hpp
index 65fd26e57..71c28b266 100644
--- a/src/SFML/Window/iOS/ClipboardImpl.hpp
+++ b/src/SFML/Window/iOS/ClipboardImpl.hpp
@@ -25,14 +25,11 @@
 #ifndef SFML_CLIPBOARDIMPLIOS_HPP
 #define SFML_CLIPBOARDIMPLIOS_HPP
 
-////////////////////////////////////////////////////////////
-// Headers
-////////////////////////////////////////////////////////////
-#include <SFML/System/String.hpp>
-
 
 namespace sf
 {
+class String;
+
 namespace priv
 {
 
diff --git a/src/SFML/Window/iOS/ClipboardImpl.mm b/src/SFML/Window/iOS/ClipboardImpl.mm
index f857bf0f1..26ebfa914 100644
--- a/src/SFML/Window/iOS/ClipboardImpl.mm
+++ b/src/SFML/Window/iOS/ClipboardImpl.mm
@@ -26,6 +26,7 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Window/iOS/ClipboardImpl.hpp>
+#include <SFML/System/String.hpp>
 
 #import <UIKit/UIKit.h>