diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 2ea80215f26ced9db3df57e2783b9c455730e586..3b5f1d14cab370df1362f9b302cf558d59405f67 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -964,7 +964,7 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
 	if (!err) {
 		map_bh(bh, inode->i_sb, map.m_pblk);
 		bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
-		bh->b_size = map.m_len << inode->i_blkbits;
+		bh->b_size = (u64)map.m_len << inode->i_blkbits;
 	}
 	return err;
 }