--- src/XrrMode.c.orig	2007-02-23 07:11:36.627073672 +0100
+++ src/XrrMode.c	2007-02-23 07:17:15.904829143 +0100
@@ -56,7 +56,7 @@
     xRRCreateModeReply	    rep;
     long		    channelSize;
 
-    RRSimpleCheckExtension (dpy, info);
+    RRCheckExtension (dpy, info, None);
 
     LockDisplay(dpy);
     GetReq (RRCreateMode, req);