diff --git a/src/Gui/PreCompiled.h b/src/Gui/PreCompiled.h
index 9caa7f39a5..33afc7351d 100644
--- a/src/Gui/PreCompiled.h
+++ b/src/Gui/PreCompiled.h
@@ -49,7 +49,7 @@
 #ifdef FC_OS_WIN32
 #define WIN32_LEAN_AND_MEAN
 #define NOMINMAX
-#include <windows.h>
+#include <Windows.h>
 #include <io.h>
 #include <shellapi.h>
 #endif