diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 96b01c7bea42..116e50470360 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -965,7 +965,7 @@ static int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 	return 0;
 }
 
-void __check_sit_bitmap(struct f2fs_sb_info *sbi,
+static void __check_sit_bitmap(struct f2fs_sb_info *sbi,
 				block_t start, block_t end)
 {
 #ifdef CONFIG_F2FS_CHECK_FS
@@ -1404,7 +1404,7 @@ static void __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
 }
 
 /* This should be covered by global mutex, &sit_i->sentry_lock */
-void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
+static void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
 {
 	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 	struct discard_cmd *dc;
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 9ec270a961e2..ec13397b635c 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1693,7 +1693,7 @@ void f2fs_quota_off_umount(struct super_block *sb)
 }
 
 #if 0
-int f2fs_get_projid(struct inode *inode, kprojid_t *projid)
+static int f2fs_get_projid(struct inode *inode, kprojid_t *projid)
 {
 	*projid = F2FS_I(inode)->i_projid;
 	return 0;