diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 8ff4b9192a9f..177ef6bd635a 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -56,7 +56,8 @@ void ext4_get_group_no_and_offset(struct super_block *sb, 
        struct ext4_super_block *es = EXT4_SB(sb)->s_es;
        ext4_grpblk_t offset;
 
-       blocknr = blocknr - le32_to_cpu(es->s_first_data_block);
+       blocknr = blocknr > le32_to_cpu(es->s_first_data_block) ?
+               blocknr - le32_to_cpu(es->s_first_data_block) : 0;
        offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) >>
                EXT4_SB(sb)->s_cluster_bits;
        if (offsetp)