diff --git a/src/ipc.c b/src/ipc.c
index 8e8c4db842..dd681f2892 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -117,6 +117,9 @@ rt_inline rt_err_t rt_ipc_list_suspend(rt_list_t        *list,
                 rt_list_insert_before(list, &(thread->tlist));
         }
         break;
+
+    default:
+        break;  
     }
 
     return RT_EOK;
diff --git a/src/timer.c b/src/timer.c
index 28a5a9e494..4d12c7ec78 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -500,7 +500,10 @@ rt_err_t rt_timer_control(rt_timer_t timer, int cmd, void *arg)
             /*timer is stop*/
             *(rt_tick_t *)arg = RT_TIMER_FLAG_DEACTIVATED;
         }
-        break;    
+        break;
+
+    default:
+        break;
     }
 
     return RT_EOK;