diff --git a/hw/xwin/winmultiwindowclass.c b/hw/xwin/winmultiwindowclass.c
index d8909f0e5..57c434669 100755
--- a/hw/xwin/winmultiwindowclass.c
+++ b/hw/xwin/winmultiwindowclass.c
@@ -264,7 +264,7 @@ winMultiWindowGetTransientFor (WindowPtr pWin, WindowPtr *ppDaddy)
       if (prop->propertyName == XA_WM_TRANSIENT_FOR)
         {
           if (ppDaddy)
-            memcpy (*ppDaddy, prop->data, sizeof (WindowPtr *));
+            memcpy (*ppDaddy, prop->data, sizeof (WindowPtr));
           return 1;
         }
       else