diff --git a/board/BearPi_STM32L431RC/BSP/Src/usart.c b/board/BearPi_STM32L431RC/BSP/Src/usart.c
index 794e1dcc..ea822c8b 100644
--- a/board/BearPi_STM32L431RC/BSP/Src/usart.c
+++ b/board/BearPi_STM32L431RC/BSP/Src/usart.c
@@ -19,7 +19,6 @@
 
 /* Includes ------------------------------------------------------------------*/
 #include "usart.h"
-#include "tos_at.h"
 
 /* USER CODE BEGIN 0 */
 uint8_t data;