diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1a4b535..882185a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -99,8 +99,7 @@ IF(WIN32)
 
     SET(PLATFORM_DESKTOP_SOURCE         Win/Desktop.cpp)
 
-    SET(PLATFORM_WINDOW_SOURCE          Win/WinWindow.h
-                                        Win/WinWindow.cpp
+    SET(PLATFORM_WINDOW_SOURCE          Win/WinWindow.cpp
                                         Win/WinMessage.cpp
                                         Win/EnumWinFonts.cpp)
 ENDIF(WIN32)