diff --git a/src/SFML/Window/Win32/WindowImplWin32.hpp b/src/SFML/Window/Win32/WindowImplWin32.hpp
index f34b5d72a..923db0e40 100644
--- a/src/SFML/Window/Win32/WindowImplWin32.hpp
+++ b/src/SFML/Window/Win32/WindowImplWin32.hpp
@@ -225,12 +225,12 @@ private :
     ////////////////////////////////////////////////////////////
     // Member data
     ////////////////////////////////////////////////////////////
-    HWND    myHandle;           ///< Win32 handle of the window
-    long    myCallback;         ///< Stores the original event callback function of the control
-    HCURSOR myCursor;           ///< The system cursor to display into the window
-    HICON   myIcon;             ///< Custom icon assigned to the window
-    bool    myKeyRepeatEnabled; ///< Automatic key-repeat state for keydown events
-    bool    myIsCursorIn;       ///< Is the mouse cursor in the window's area ?
+    HWND     myHandle;           ///< Win32 handle of the window
+    LONG_PTR myCallback;         ///< Stores the original event callback function of the control
+    HCURSOR  myCursor;           ///< The system cursor to display into the window
+    HICON    myIcon;             ///< Custom icon assigned to the window
+    bool     myKeyRepeatEnabled; ///< Automatic key-repeat state for keydown events
+    bool     myIsCursorIn;       ///< Is the mouse cursor in the window's area ?
 };
 
 } // namespace priv