diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e91f978..3afd5f1 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2318,7 +2318,7 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
 			/* not enough space to reserve */
 			return ret;
 
-		map_bh(bh_result, inode->i_sb, 0);
+		map_bh(bh_result, inode->i_sb, -1);
 		set_buffer_new(bh_result);
 		set_buffer_delay(bh_result);
 	} else if (ret > 0) {