diff --git a/src/msw/window.cpp b/src/msw/window.cpp
index 8f009f6ffa..7e0c56855d 100644
--- a/src/msw/window.cpp
+++ b/src/msw/window.cpp
@@ -3545,7 +3545,7 @@ void wxAssociateWinWithHandle(HWND hwnd, wxWindowMSW *win)
     }
 #endif // __WXDEBUG__
 
-    gs_windowHandles[hwnd] = win;
+    gs_windowHandles[hwnd] = (wxWindow *)win;
 }
 
 void wxRemoveHandleAssociation(wxWindowMSW *win)