diff --git a/include/SFML/Network/Packet.hpp b/include/SFML/Network/Packet.hpp
index e7e3a3ac1..da8f89b73 100644
--- a/include/SFML/Network/Packet.hpp
+++ b/include/SFML/Network/Packet.hpp
@@ -33,6 +33,7 @@
 #include <vector>
 
 #include <cstddef>
+#include <cstdint>
 
 
 namespace sf
diff --git a/include/SFML/System/String.hpp b/include/SFML/System/String.hpp
index 2641740ba..9e2449396 100644
--- a/include/SFML/System/String.hpp
+++ b/include/SFML/System/String.hpp
@@ -34,6 +34,8 @@
 #include <locale>
 #include <string>
 
+#include <cstdint>
+
 
 namespace sf
 {
diff --git a/include/SFML/System/Utf.hpp b/include/SFML/System/Utf.hpp
index b56ea7e97..bd5dd4f92 100644
--- a/include/SFML/System/Utf.hpp
+++ b/include/SFML/System/Utf.hpp
@@ -31,6 +31,7 @@
 
 #include <locale>
 
+#include <cstdint>
 #include <cstdlib>