diff --git a/randr/rrproviderproperty.c b/randr/rrproviderproperty.c
index dfaf956675..8a340eb091 100644
--- a/randr/rrproviderproperty.c
+++ b/randr/rrproviderproperty.c
@@ -655,7 +655,7 @@ ProcRRGetProviderProperty(ClientPtr client)
         }
     }
 
-    WriteToClient(client, sizeof(xGenericReply), &reply);
+    WriteToClient(client, sizeof(reply), &reply);
     WriteToClient(client, len, extra);
     free(extra);