diff --git a/xfixes/disconnect.c b/xfixes/disconnect.c
index 8d52b50aa..fea2ab33a 100644
--- a/xfixes/disconnect.c
+++ b/xfixes/disconnect.c
@@ -66,6 +66,7 @@ ProcXFixesSetClientDisconnectMode(ClientPtr client)
     ClientDisconnectPtr pDisconnect = GetClientDisconnect(client);
 
     REQUEST(xXFixesSetClientDisconnectModeReq);
+    REQUEST_SIZE_MATCH(xXFixesSetClientDisconnectModeReq);
 
     pDisconnect->disconnect_mode = stuff->disconnect_mode;
 
@@ -76,7 +77,7 @@ int _X_COLD
 SProcXFixesSetClientDisconnectMode(ClientPtr client)
 {
     REQUEST(xXFixesSetClientDisconnectModeReq);
-    REQUEST_AT_LEAST_SIZE(xXFixesSetClientDisconnectModeReq);
+    REQUEST_SIZE_MATCH(xXFixesSetClientDisconnectModeReq);
 
     swapl(&stuff->disconnect_mode);