diff --git a/DFRobot_DF2301Q.h b/DFRobot_DF2301Q.h
index e52f012..ddcc5c8 100644
--- a/DFRobot_DF2301Q.h
+++ b/DFRobot_DF2301Q.h
@@ -231,6 +231,8 @@ class DFRobot_DF2301Q_UART: public DFRobot_DF2301Q
     // uint8_t tail;   /* send add auto */
   }sUartMsg_t;
 
+  #pragma pack()
+
   /**
    * @enum eReceiveState_t
    * @brief receive use state machine method, so two char can arrive different time