diff --git a/bsp/fh8620/drivers/pwm.c b/bsp/fh8620/drivers/pwm.c
index 37978f21861bbbcca8e44a8a2fdc4670cfeda23e..58c9703d78245bcb524ad53edaf0b6dd38562dd6 100644
--- a/bsp/fh8620/drivers/pwm.c
+++ b/bsp/fh8620/drivers/pwm.c
@@ -186,7 +186,7 @@ int fh_pwm_probe(void *priv_data)
 
     PWM_Enable(pwm_obj, RT_FALSE);
 
-    pwm_dev = rt_calloc(sizeof(struct rt_device));
+    pwm_dev = rt_calloc(1,sizeof(struct rt_device));
 
     if (pwm_dev == RT_NULL)
     {