diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index 8bdc38d81adf..b941e6d59fd6 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -575,7 +575,7 @@ static inline unsigned long hpet_time_div(struct hpets *hpets,
 }
 
 static int
-hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg,
+hpet_ioctl_common(struct hpet_dev *devp, unsigned int cmd, unsigned long arg,
 		  struct hpet_info *info)
 {
 	struct hpet_timer __iomem *timer;