diff --git a/src/kmulti_rtimer.c b/src/kmulti_rtimer.c
index bb9477d6ea7256af0a02a6dbdc611256f317607e..3c855515fc270a54212c8c2915208d1f3d2cee91 100644
--- a/src/kmulti_rtimer.c
+++ b/src/kmulti_rtimer.c
@@ -482,7 +482,9 @@ void kmulti_rtimer_check(void)
 
     rt_list_init(&list);
 
+#ifdef RT_DEBUG_LOG
     RT_DEBUG_LOG(RT_DEBUG_TIMER, ("timer check enter\n"));
+#endif /* RT_DEBUG_LOG */
 
     current_tick = rtimer_tick_get();
 
@@ -517,7 +519,9 @@ void kmulti_rtimer_check(void)
             current_tick = rtimer_tick_get();
 
             RT_OBJECT_HOOK_CALL(kmulti_rtimer_exit_hook, (t));
+#ifdef RT_DEBUG_LOG
             RT_DEBUG_LOG(RT_DEBUG_TIMER, ("current tick: %d\n", current_tick));
+#endif /* RT_DEBUG_LOG */
 
             /* Check whether the timer object is detached or started again */
             if (rt_list_isempty(&list))
@@ -539,7 +543,9 @@ void kmulti_rtimer_check(void)
     /* enable interrupt */
     rt_hw_interrupt_enable(level);
 
+#ifdef RT_DEBUG_LOG
     RT_DEBUG_LOG(RT_DEBUG_TIMER, ("timer check leave\n"));
+#endif /* RT_DEBUG_LOG */
 }
 
 /**