diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 4f1b30bf0c27..0ec588309752 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1364,7 +1364,7 @@ static int ufs_mtk_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
-int ufs_mtk_system_suspend(struct device *dev)
+static int ufs_mtk_system_suspend(struct device *dev)
 {
 	struct ufs_hba *hba = dev_get_drvdata(dev);
 	int ret;
@@ -1378,7 +1378,7 @@ int ufs_mtk_system_suspend(struct device *dev)
 	return 0;
 }
 
-int ufs_mtk_system_resume(struct device *dev)
+static int ufs_mtk_system_resume(struct device *dev)
 {
 	struct ufs_hba *hba = dev_get_drvdata(dev);
 
@@ -1388,7 +1388,7 @@ int ufs_mtk_system_resume(struct device *dev)
 }
 #endif
 
-int ufs_mtk_runtime_suspend(struct device *dev)
+static int ufs_mtk_runtime_suspend(struct device *dev)
 {
 	struct ufs_hba *hba = dev_get_drvdata(dev);
 	int ret = 0;
@@ -1402,7 +1402,7 @@ int ufs_mtk_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-int ufs_mtk_runtime_resume(struct device *dev)
+static int ufs_mtk_runtime_resume(struct device *dev)
 {
 	struct ufs_hba *hba = dev_get_drvdata(dev);