diff --git a/drivers/usb/chipidea/ci_hdrc_npcm.c b/drivers/usb/chipidea/ci_hdrc_npcm.c
index c89c68f41ccc..3e5e05dbda89 100644
--- a/drivers/usb/chipidea/ci_hdrc_npcm.c
+++ b/drivers/usb/chipidea/ci_hdrc_npcm.c
@@ -18,7 +18,7 @@ struct npcm_udc_data {
 	struct ci_hdrc_platform_data pdata;
 };
 
-static int npcm_udc_notify_event(struct ci_hdrc *ci, unsigned event)
+static int npcm_udc_notify_event(struct ci_hdrc *ci, unsigned int event)
 {
 	struct device *dev = ci->dev->parent;