diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index f914b5db7ff16d33d7a75cb40db1278718e22053..1ae45bd9d27d51d15a511b85ad5a520e54c1dd65 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -983,7 +983,8 @@ static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
 		return false;
 
 	next = defrag_lookup_extent(inode, em->start + em->len);
-	if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
+	if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE ||
+	    (em->block_start + em->block_len == next->block_start))
 		ret = false;
 
 	free_extent_map(next);