diff --git a/bsp/m16c62p/application.c b/bsp/m16c62p/application.c
index 22129d300d..455104c15f 100644
--- a/bsp/m16c62p/application.c
+++ b/bsp/m16c62p/application.c
@@ -21,6 +21,7 @@
 
 static struct rt_thread led;
 
+ALIGN(RT_ALIGN_SIZE)
 static rt_uint8_t led_stack[256];
 
 static void rt_thread_entry_led(void* parameter)