diff --git a/bsp/stm32/stm32f091-st-nucleo/applications/main.c b/bsp/stm32/stm32f091-st-nucleo/applications/main.c
index 98ca179cd6..421f897bc4 100644
--- a/bsp/stm32/stm32f091-st-nucleo/applications/main.c
+++ b/bsp/stm32/stm32f091-st-nucleo/applications/main.c
@@ -12,14 +12,24 @@
 #include <rtdevice.h>
 #include <board.h>
 
+/* defined the LED2 pin: PA5 */
+#define LED2_PIN    GET_PIN(A, 5)
+
 int main(void)
 {
     int count = 1;
 
+    /* set LED2 pin mode to output */
+    rt_pin_mode(LED2_PIN, PIN_MODE_OUTPUT);
+
     while (count++)
     {
+        rt_pin_write(LED2_PIN, PIN_HIGH);
+        rt_thread_mdelay(500);
+        rt_pin_write(LED2_PIN, PIN_LOW);
         rt_thread_mdelay(500);
     }
-
     return RT_EOK;
 }
+
+