diff --git a/server/wsproxy/constant.h b/server/wsproxy/constant.h
index 639786a..a2ba8b2 100644
--- a/server/wsproxy/constant.h
+++ b/server/wsproxy/constant.h
@@ -39,3 +39,5 @@ const int POSTFIX_LEN = 7;
 
 const int MAX_NODE_ID = 8;
 const int MAX_INSTANCE_ID = 500;
+
+const int ALLOC_TARGET_SERVER_SUCCESS_TIMER_EVENT = a8::TIMER_USER_EVENT + 1;