diff --git a/factory_settings.ini b/factory_settings.ini
index 12a99b948..b8c4c81ad 100644
--- a/factory_settings.ini
+++ b/factory_settings.ini
@@ -38,7 +38,7 @@ build_flags =
     -D FACTORY_MQTT_PASSWORD=\"\"
     -D FACTORY_MQTT_CLIENT_ID=\"ems-esp\"
     -D FACTORY_MQTT_KEEP_ALIVE=60
-    -D FACTORY_MQTT_CLEAN_SESSION=false
+    -D FACTORY_MQTT_CLEAN_SESSION=true
     -D FACTORY_MQTT_MAX_TOPIC_LENGTH=128
 
     ; JWT Secret