diff --git a/plat/hisilicon/hikey/include/hi6220_regs_peri.h b/plat/hisilicon/hikey/include/hi6220_regs_peri.h
index 8711ae4..77236e8 100644
--- a/plat/hisilicon/hikey/include/hi6220_regs_peri.h
+++ b/plat/hisilicon/hikey/include/hi6220_regs_peri.h
@@ -134,7 +134,7 @@
 #define PERI_CTRL4_OTG_SESSEND			(1 << 28)
 #define PERI_CTRL4_OTG_BVALID			(1 << 29)
 #define PERI_CTRL4_OTG_AVALID			(1 << 30)
-#define PERI_CTRL4_OTG_VBUSVALID		(1 << 31)
+#define PERI_CTRL4_OTG_VBUSVALID		(1U << 31)
 
 /* PERI_SC_PERIPH_CTRL5 */
 #define PERI_CTRL5_USBOTG_RES_SEL		(1 << 3)