diff --git a/server/wsproxy/longsessionmgr.cc b/server/wsproxy/longsessionmgr.cc
index 4600840..7ebb49a 100644
--- a/server/wsproxy/longsessionmgr.cc
+++ b/server/wsproxy/longsessionmgr.cc
@@ -96,7 +96,7 @@ void LongSessionMgr::DelSession(int socket_handle)
 {
     {
         auto session = GetSession(socket_handle);
-        if (session && session.use_count() != 1) {
+        if (session && session.use_count() != 2) {
 #ifdef DEBUG
             abort();
 #endif