diff --git a/Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_def.h b/Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_def.h
index f9bbec2de..d0a683531 100644
--- a/Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_def.h
+++ b/Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_def.h
@@ -54,7 +54,9 @@ typedef enum
 
 /* Exported macro ------------------------------------------------------------*/
 
-#define UNUSED(X) (void)X      /* To avoid gcc/g++ warnings */
+#ifndef UNUSED
+  #define UNUSED(X) (void)X      /* To avoid gcc/g++ warnings */
+#endif
 
 #define HAL_MAX_DELAY      0xFFFFFFFFU