diff --git a/src/observer/mysql/obmp_default.h b/src/observer/mysql/obmp_default.h
index 86ab8c1e351954450dc8d1946f4a9489e1390f7c..ecfafb7b879bcf0a4855516606f8d8c0f776471e 100644
--- a/src/observer/mysql/obmp_default.h
+++ b/src/observer/mysql/obmp_default.h
@@ -37,6 +37,7 @@ public:
       } else {
         SERVER_LOG(WARN, "MySQL command not supported", "cmd", pkt.get_cmd());
       }
+      disconnect();
     }
     return ret;
   }