diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index a54b3ab52f1a..d82be8c1502a 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2001,8 +2001,9 @@ static int f2fs_expand_inode_data(struct inode *inode, loff_t offset,
 		block_t sec_len;
 
 		if (map.m_lblk % sec_blks) {
-			map.m_lblk = rounddown(map.m_lblk, sec_blks);
-			map.m_len = pg_end - map.m_lblk;
+			pg_start = rounddown(map.m_lblk, sec_blks);
+			map.m_lblk = pg_start;
+			map.m_len = pg_end - pg_start;
 			if (off_end)
 				map.m_len++;
 		}