1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index b60955d4f9bf..996ad56b57db 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -255,7 +255,7 @@ static void try_merge_map(struct extent_map_tree *tree, struct extent_map *em)
                 merge = rb_entry(rb, struct extent_map, rb_node);
         if (rb && mergable_maps(em, merge)) {
                 em->len += merge->len;
-                em->block_len += merge->len;
+                em->block_len += merge->block_len;
                 rb_erase(&merge->rb_node, &tree->map);
                 merge->in_tree = 0;
                 em->mod_len = (merge->mod_start + merge->mod_len) - em->mod_start;