diff --git a/pymammotion/mammotion/commands/messages/system.py b/pymammotion/mammotion/commands/messages/system.py
index dfbfd15..658de99 100644
--- a/pymammotion/mammotion/commands/messages/system.py
+++ b/pymammotion/mammotion/commands/messages/system.py
@@ -246,7 +246,7 @@ def request_iot_sys(
             )
         )
         logger.debug(f"Send command==== IOT slim data Act {
-            build.todev_report_cfg.act} {build}")
+            build.todev_report_cfg.act}")
         return self.send_order_msg_sys_legacy(build)
 
     def get_report_cfg_stop(self, timeout: int = 10000, period: int = 1000, no_change_period: int = 1000):