--- a/src/SFML/Window/Unix/WindowImplX11.cpp
+++ b/src/SFML/Window/Unix/WindowImplX11.cpp
@@ -1556,7 +1556,7 @@
                                    m_window,
                                    XNInputStyle,
                                    XIMPreeditNothing | XIMStatusNothing,
-                                   reinterpret_cast<void*>(NULL));
+                                   reinterpret_cast<void*>(0));
     }
     else
     {