diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_lcd.c b/bsp/stm32/libraries/HAL_Drivers/drv_lcd.c
index 3f6de0286f..2ebd013edd 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_lcd.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_lcd.c
@@ -254,6 +254,11 @@ void turn_on_lcd_backlight(void)
 
     rt_pin_write(LCD_DISP_GPIO_NUM, PIN_HIGH);
     rt_pin_write(LCD_BL_GPIO_NUM, PIN_HIGH);
+}
+#else
+void turn_on_lcd_backlight(void)
+{
+    
 }
 #endif