diff --git a/fs/btrfs/fiemap.c b/fs/btrfs/fiemap.c
index ba6a360074c0..7a2a97180099 100644
--- a/fs/btrfs/fiemap.c
+++ b/fs/btrfs/fiemap.c
@@ -660,7 +660,7 @@ static int extent_fiemap(struct btrfs_inode *inode,
 	range_end = round_up(start + len, sectorsize);
 	prev_extent_end = range_start;
 
-	btrfs_lock_extent(&inode->io_tree, range_start, range_end, &cached_state);
+	btrfs_lock_extent(&inode->io_tree, range_start, range_end - 1, &cached_state);
 
 	ret = fiemap_find_last_extent_offset(inode, path, &last_extent_end);
 	if (ret < 0)
@@ -840,7 +840,7 @@ static int extent_fiemap(struct btrfs_inode *inode,
 	}
 
 out_unlock:
-	btrfs_unlock_extent(&inode->io_tree, range_start, range_end, &cached_state);
+	btrfs_unlock_extent(&inode->io_tree, range_start, range_end - 1, &cached_state);
 
 	if (ret == BTRFS_FIEMAP_FLUSH_CACHE) {
 		btrfs_release_path(path);