diff --git a/plat/marvell/a8k/common/include/a8k_plat_def.h b/plat/marvell/a8k/common/include/a8k_plat_def.h
index 8b7cd64..de80315 100644
--- a/plat/marvell/a8k/common/include/a8k_plat_def.h
+++ b/plat/marvell/a8k/common/include/a8k_plat_def.h
@@ -18,7 +18,7 @@
 #define GWD_IIDR2_REV_ID_OFFSET		12
 #define GWD_IIDR2_REV_ID_MASK		0xF
 #define GWD_IIDR2_CHIP_ID_OFFSET	20
-#define GWD_IIDR2_CHIP_ID_MASK		(0xFFF << GWD_IIDR2_CHIP_ID_OFFSET)
+#define GWD_IIDR2_CHIP_ID_MASK		(0xFFFu << GWD_IIDR2_CHIP_ID_OFFSET)
 
 #define CHIP_ID_AP806			0x806
 #define CHIP_ID_AP807			0x807