--- Xext/xvdisp.c	2010-07-08 21:03:14.099571582 +0000
+++ Xext/xvdisp.c	2010-07-08 21:03:33.089027336 +0000
@@ -1267,7 +1267,7 @@
 
   UpdateCurrentTime();
 
-  if (stuff->data > xvNumRequests) {
+  if (stuff->data > xv_LastRequest) {
     SendErrorToClient(client, XvReqCode, stuff->data, 0, BadRequest);
     return(BadRequest);
   }