diff --git a/src/ipc.c b/src/ipc.c
index c67909cfe0edc79ce68e0e83d2465f34494287b2..067bd5f7ba2e17a49132e13c3462e8de6126070c 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -119,6 +119,9 @@ 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 28a5a9e494ced8176f2efb74923feb767a2d3723..4d12c7ec782bd8468cc3f72e8b17a9433547a92a 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;