diff --git a/randr/rrcrtc.c b/randr/rrcrtc.c
index 1e0429071..2ae9040d1 100644
--- a/randr/rrcrtc.c
+++ b/randr/rrcrtc.c
@@ -868,7 +868,7 @@ ProcRRSetCrtcGamma (ClientPtr client)
     unsigned long		len;
     CARD16			*red, *green, *blue;
     
-    REQUEST_SIZE_MATCH(xRRSetCrtcGammaReq);
+    REQUEST_AT_LEAST_SIZE(xRRSetCrtcGammaReq);
     crtc = LookupCrtc (client, stuff->crtc, SecurityWriteAccess);
     if (!crtc)
 	return RRErrorBase + BadRRCrtc;