diff --git a/xkb/xkbSwap.c b/xkb/xkbSwap.c
index 1c1ed5ff4..50cabb90e 100644
--- a/xkb/xkbSwap.c
+++ b/xkb/xkbSwap.c
@@ -76,7 +76,7 @@ SProcXkbSelectEvents(ClientPtr client)
         register unsigned bit, ndx, maskLeft, dataLeft, size;
 
         from.c8 = (CARD8 *) &stuff[1];
-        dataLeft = (stuff->length * 4) - SIZEOF(xkbSelectEventsReq);
+        dataLeft = (client->req_len * 4) - SIZEOF(xkbSelectEventsReq);
         maskLeft = (stuff->affectWhich & (~XkbMapNotifyMask));
         for (ndx = 0, bit = 1; (maskLeft != 0); ndx++, bit <<= 1) {
             if (((bit & maskLeft) == 0) || (ndx == XkbMapNotify))