diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1aebd2ee2704..b6c763a17406 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6149,9 +6149,18 @@ static int btrfs_set_inode_index_count(struct btrfs_inode *inode)
 	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
 	if (ret < 0)
 		return ret;
-	/* FIXME: we should be able to handle this */
-	if (ret == 0)
-		return ret;
+
+	if (unlikely(ret == 0)) {
+		/*
+		 * Key with offset -1 found, there would have to exist a dir
+		 * index item with such offset, but this is out of the valid
+		 * range.
+		 */
+		btrfs_err(root->fs_info,
+			  "unexpected exact match for DIR_INDEX key, inode %llu",
+			  btrfs_ino(inode));
+		return -EUCLEAN;
+	}
 
 	if (path->slots[0] == 0) {
 		inode->index_cnt = BTRFS_DIR_START_INDEX;