diff --git a/src/Internal/RepeatAfter.h b/src/Internal/RepeatAfter.h
index 46a5081..3a40f86 100644
--- a/src/Internal/RepeatAfter.h
+++ b/src/Internal/RepeatAfter.h
@@ -18,7 +18,7 @@ namespace TimersOneForAll
 	}
 	//每隔指定毫秒数重复执行任务。重复次数若为负数，或不指定重复次数，则默认无限重复
 	template <uint8_t TimerCode, uint16_t IntervalMilliseconds, void (*DoTask)(), void (*DoneCallback)() = nullptr>
-	void RepeatAfter(int32_t RepeatTimes = -1)
+	void RepeatAfter(int32_t RepeatTimes)
 	{
 		constexpr Internal::TimerSetting TS = Internal::GetTimerSetting(TimerCode, IntervalMilliseconds);
 		Internal::SLRepeaterSet<TimerCode, TS.TCNT, TS.PrescalerBits, DoTask, DoneCallback>(RepeatTimes);
diff --git a/src/Internal/SquareWave.h b/src/Internal/SquareWave.h
index 4bece8d..d8902b6 100644
--- a/src/Internal/SquareWave.h
+++ b/src/Internal/SquareWave.h
@@ -266,7 +266,7 @@ namespace TimersOneForAll
 	}
 	//生成循环数有限的方波。如不指定循环次数，默认无限循环
 	template <uint8_t TimerCode, uint8_t PinCode, uint16_t HighMilliseconds, uint16_t LowMilliseconds, void (*DoneCallback)() = nullptr>
-	void SquareWave(int16_t RepeatTimes = -1)
+	void SquareWave(int16_t RepeatTimes)
 	{
 		Internal::InternalSW<TimerCode, PinCode, HighMilliseconds, LowMilliseconds, DoneCallback>(RepeatTimes);
 	}