diff --git a/plat/mediatek/mt8183/drivers/mcsi/mcsi.h b/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
index c13e22a..8a588bf 100644
--- a/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
+++ b/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
@@ -41,7 +41,7 @@
 #define BD_CTRL_REG			0x40
 
 /* Snoop Control register bit definitions */
-#define DVM_SUPPORT			(1 << 31)
+#define DVM_SUPPORT			(1U << 31)
 #define SNP_SUPPORT			(1 << 30)
 #define SHAREABLE_OVWRT			(1 << 2)
 #define DVM_EN_BIT			(1 << 1)
diff --git a/plat/mediatek/mt8183/include/mcucfg.h b/plat/mediatek/mt8183/include/mcucfg.h
index c84f2a7..83ee88f 100644
--- a/plat/mediatek/mt8183/include/mcucfg.h
+++ b/plat/mediatek/mt8183/include/mcucfg.h
@@ -197,7 +197,7 @@
 	MP0_CPUCFG_64BIT_SHIFT = 12,
 	MP1_CPUCFG_64BIT_SHIFT = 28,
 	MP0_CPUCFG_64BIT = 0xf << MP0_CPUCFG_64BIT_SHIFT,
-	MP1_CPUCFG_64BIT = 0xf << MP1_CPUCFG_64BIT_SHIFT
+	MP1_CPUCFG_64BIT = 0xfu << MP1_CPUCFG_64BIT_SHIFT
 };
 
 /* scu related */
diff --git a/plat/mediatek/mt8183/include/platform_def.h b/plat/mediatek/mt8183/include/platform_def.h
index 7820988..bc9022b 100644
--- a/plat/mediatek/mt8183/include/platform_def.h
+++ b/plat/mediatek/mt8183/include/platform_def.h
@@ -180,7 +180,7 @@
 #define MTK_WDT_STATUS_SECURITY_RST         (1 << 28)
 #define MTK_WDT_STATUS_IRQ_ASSERT           (1 << 29)
 #define MTK_WDT_STATUS_SW_WDT_RST           (1 << 30)
-#define MTK_WDT_STATUS_HW_WDT_RST           (1 << 31)
+#define MTK_WDT_STATUS_HW_WDT_RST           (1U << 31)
 
 /* RGU other related */
 #define MTK_WDT_MODE_DUAL_MODE    0x0040