diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 232c99e4a1ee..3f2fe6034640 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -255,10 +255,10 @@ static int f2fs_sb_read_encoding(const struct f2fs_super_block *sb,
 
 static inline void limit_reserve_root(struct f2fs_sb_info *sbi)
 {
-	block_t limit = min((sbi->user_block_count << 1) / 1000,
+	block_t limit = min((sbi->user_block_count >> 3),
 			sbi->user_block_count - sbi->reserved_blocks);
 
-	/* limit is 0.2% */
+	/* limit is 12.5% */
 	if (test_opt(sbi, RESERVE_ROOT) &&
 			F2FS_OPTION(sbi).root_reserved_blocks > limit) {
 		F2FS_OPTION(sbi).root_reserved_blocks = limit;