diff --git a/src/soc/mediatek/common/include/soc/mcu_common.h b/src/soc/mediatek/common/include/soc/mcu_common.h
index 974da52f35..7689c1b814 100644
--- a/src/soc/mediatek/common/include/soc/mcu_common.h
+++ b/src/soc/mediatek/common/include/soc/mcu_common.h
@@ -13,6 +13,6 @@ struct mtk_mcu {
 	void (*reset)(struct mtk_mcu *mcu);	/* The reset callback */
 };
 
-int mtk_init_mcu(struct mtk_mcu *mcu);
+enum cb_err mtk_init_mcu(struct mtk_mcu *mcu);
 
 #endif /* SOC_MEDIATEK_MTLIB_COMMON_H */
diff --git a/src/soc/mediatek/common/mcu.c b/src/soc/mediatek/common/mcu.c
index 42b312449f..ca2bdbbd96 100644
--- a/src/soc/mediatek/common/mcu.c
+++ b/src/soc/mediatek/common/mcu.c
@@ -7,7 +7,7 @@
 #include <soc/symbols.h>
 #include <timer.h>
 
-int mtk_init_mcu(struct mtk_mcu *mcu)
+enum cb_err mtk_init_mcu(struct mtk_mcu *mcu)
 {
 	struct stopwatch sw;