diff --git a/components/drivers/hwtimer/hwtimer.c b/components/drivers/hwtimer/hwtimer.c
index bbe50aa2f7..066c5f6f6c 100644
--- a/components/drivers/hwtimer/hwtimer.c
+++ b/components/drivers/hwtimer/hwtimer.c
@@ -192,14 +192,15 @@ static rt_size_t rt_hwtimer_write(struct rt_device *dev, rt_off_t pos, const voi
     if (size != sizeof(rt_hwtimerval_t))
         return 0;
 
-    if ((timer->cycles <= 1) && (timer->mode == HWTIMER_MODE_ONESHOT))
-    {
-        opm = HWTIMER_MODE_ONESHOT;
-    }
     timer->ops->stop(timer);
     timer->overflow = 0;
 
     t = timeout_calc(timer, (rt_hwtimerval_t*)buffer);
+    if ((timer->cycles <= 1) && (timer->mode == HWTIMER_MODE_ONESHOT))
+    {
+        opm = HWTIMER_MODE_ONESHOT;
+    }
+
     if (timer->ops->start(timer, t, opm) != RT_EOK)
         size = 0;