diff --git a/basis/x11/windows/windows.factor b/basis/x11/windows/windows.factor
index 87a212bd8e..37da51e9b8 100644
--- a/basis/x11/windows/windows.factor
+++ b/basis/x11/windows/windows.factor
@@ -6,7 +6,7 @@ arrays fry ;
 IN: x11.windows
 
 : create-window-mask ( -- n )
-    { CWColormap CWEventMask } flags ;
+    { CWBackPixel CWBorderPixel CWColormap CWEventMask } flags ;
 
 : create-colormap ( visinfo -- colormap )
     [ dpy get root get ] dip XVisualInfo-visual AllocNone