diff --git a/src/paho/mqtt/client.py b/src/paho/mqtt/client.py
index ae2b511c..eab9cf4e 100644
--- a/src/paho/mqtt/client.py
+++ b/src/paho/mqtt/client.py
@@ -1635,7 +1635,7 @@ def loop_misc(self):
             if self._state == mqtt_cs_disconnecting:
                 rc = MQTT_ERR_SUCCESS
             else:
-                rc = 1
+                rc = MQTT_ERR_CONN_LOST
 
             with self._callback_mutex:
                 if self.on_disconnect: