diff --git a/extra/webbrowser/windows/windows.factor b/extra/webbrowser/windows/windows.factor
index 47f06c9db1..e7d994c5d1 100644
--- a/extra/webbrowser/windows/windows.factor
+++ b/extra/webbrowser/windows/windows.factor
@@ -1,7 +1,7 @@
 ! Copyright (C) 2011 John Benediktsson
 ! See http://factorcode.org/license.txt for BSD license
 
-USING: webbrowser windows.shell32 windows.user32 ;
+USING: system webbrowser windows.shell32 windows.user32 ;
 
 IN: webbrowser.windows