diff --git a/hw/xwin/winmultiwindowwindow.c b/hw/xwin/winmultiwindowwindow.c
index f9ada7ca9..8b18aeb50 100644
--- a/hw/xwin/winmultiwindowwindow.c
+++ b/hw/xwin/winmultiwindowwindow.c
@@ -76,6 +76,7 @@ winFindWindow (pointer value, XID id, pointer cdata);
 
 #define SubStrSend(pWin,pParent) (StrSend(pWin) || SubSend(pParent))
 
+static
 void winInitMultiWindowClass(void)
 {
   static wATOM atomXWinClass=0;