diff --git a/halport/stm32irq.c b/halport/stm32irq.c
index 75d4193..5e16a03 100644
--- a/halport/stm32irq.c
+++ b/halport/stm32irq.c
@@ -89,9 +89,9 @@ void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
     if (huart->USR_UartITRxOff < huart->USR_UartITRxBufSize) {
       huart->USR_UartITRxBuf[huart->USR_UartITRxOff] = huart->USR_UartITRxBufCache;
       huart->USR_UartITRxOff++;
+      huart->USR_UartITLastRxTicket = HAL_GetTick();
     } else {
     }
-    huart->USR_UartITLastRxTicket = HAL_GetTick();
     HAL_UART_Receive_IT(huart, &huart->USR_UartITRxBufCache, 1);
   }
 }