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 */