diff --git a/plat/hisilicon/hikey960/include/hi3660.h b/plat/hisilicon/hikey960/include/hi3660.h
index 5b9305a..7cc1ee0 100644
--- a/plat/hisilicon/hikey960/include/hi3660.h
+++ b/plat/hisilicon/hikey960/include/hi3660.h
@@ -67,7 +67,7 @@
 #define SCTRL_SCPERDIS1_REG		(SCTRL_REG_BASE + 0x174)
 #define SCTRL_SCPEREN1_REG		(SCTRL_REG_BASE + 0x170)
 #define SCTRL_SCPERDIS1_REG		(SCTRL_REG_BASE + 0x174)
-#define SCPEREN1_WAIT_DDR_SELFREFRESH_DONE_BYPASS	(1 << 31)
+#define SCPEREN1_WAIT_DDR_SELFREFRESH_DONE_BYPASS	(1u << 31)
 #define SCPEREN_GT_PCLK_MMBUFCFG	(1 << 25)
 #define SCPEREN_GT_PCLK_MMBUF		(1 << 23)
 #define SCPEREN_GT_ACLK_MMBUF		(1 << 22)