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)
diff --git a/plat/hisilicon/hikey960/include/hi3660_crg.h b/plat/hisilicon/hikey960/include/hi3660_crg.h
index ec587aa..eb5a6c5 100644
--- a/plat/hisilicon/hikey960/include/hi3660_crg.h
+++ b/plat/hisilicon/hikey960/include/hi3660_crg.h
@@ -11,7 +11,7 @@
 #define CRG_PEREN0_REG			(CRG_REG_BASE + 0x000)
 #define CRG_PERDIS0_REG			(CRG_REG_BASE + 0x004)
 #define CRG_PERSTAT0_REG		(CRG_REG_BASE + 0x008)
-#define PEREN0_GT_CLK_AOMM		(1 << 31)
+#define PEREN0_GT_CLK_AOMM		(1U << 31)
 
 #define CRG_PEREN1_REG			(CRG_REG_BASE + 0x010)
 #define CRG_PERDIS1_REG			(CRG_REG_BASE + 0x014)
@@ -62,7 +62,7 @@
 #define CRG_PERRSTSTAT5_REG		(CRG_REG_BASE + 0x0A4)
 
 /* bit fields in CRG_PERI */
-#define PERI_PCLK_PCTRL_BIT		(1 << 31)
+#define PERI_PCLK_PCTRL_BIT		(1U << 31)
 #define PERI_TIMER12_BIT		(1 << 25)
 #define PERI_TIMER11_BIT		(1 << 24)
 #define PERI_TIMER10_BIT		(1 << 23)
diff --git a/plat/hisilicon/hikey960/include/hi3660_hkadc.h b/plat/hisilicon/hikey960/include/hi3660_hkadc.h
index 4d2de4a..dc9e813 100644
--- a/plat/hisilicon/hikey960/include/hi3660_hkadc.h
+++ b/plat/hisilicon/hikey960/include/hi3660_hkadc.h
@@ -13,7 +13,7 @@
 #define HKADC_DSP_START_CLR_REG			(HKADC_SSI_REG_BASE + 0x01C)
 #define HKADC_WR01_DATA_REG			(HKADC_SSI_REG_BASE + 0x020)
 
-#define WR1_WRITE_MODE				(1 << 31)
+#define WR1_WRITE_MODE				(1U << 31)
 #define WR1_READ_MODE				(0 << 31)
 #define WR1_ADDR(x)				(((x) & 0x7F) << 24)
 #define WR1_DATA(x)				(((x) & 0xFF) << 16)
@@ -47,7 +47,7 @@
 
 #define HKADC_WR01_VALUE			((HKADC_START_ADDR << 24) | \
 						 (0x1 << 16))
-#define HKADC_WR23_VALUE			((0x1 << 31) |		\
+#define HKADC_WR23_VALUE			((0x1u << 31) |		\
 						 (HKADC_DATA0_ADDR << 24) | \
 						 (1 << 15) |		\
 						 (HKADC_DATA1_ADDR << 8))