diff --git a/Xext/xvdisp.c b/Xext/xvdisp.c
index 237ad51c0..de0128e14 100644
--- a/Xext/xvdisp.c
+++ b/Xext/xvdisp.c
@@ -1588,6 +1588,7 @@ SProcXvSetPortAttribute(ClientPtr client)
   swaps(&stuff->length, n);
   swapl(&stuff->port, n);
   swapl(&stuff->attribute, n);
+  swapl(&stuff->value, n);
   return XvProcVector[xv_SetPortAttribute](client);
 }