diff --git a/skynet-src/skynet_timer.c b/skynet-src/skynet_timer.c
index a6b4bb87..f23114dc 100644
--- a/skynet-src/skynet_timer.c
+++ b/skynet-src/skynet_timer.c
@@ -146,7 +146,7 @@ dispatch_list(struct timer_node *current) {
 		message.source = 0;
 		message.session = event->session;
 		message.data = NULL;
-		message.sz = (size_t)MESSAGE_TYPE_SHIFT << MESSAGE_TYPE_SHIFT;
+		message.sz = (size_t)PTYPE_RESPONSE << MESSAGE_TYPE_SHIFT;
 
 		skynet_context_push(event->handle, &message);