1 files changed, 2 insertions, 0 deletions
diff --git a/dir.c b/dir.c
index 5b00dfb5b1..166238e79f 100644
--- a/dir.c
+++ b/dir.c
@@ -3533,6 +3533,8 @@ static void connect_wt_gitdir_in_nested(const char *sub_worktree,
 	if (repo_read_index(&subrepo) < 0)
 		die(_("index file corrupt in repo %s"), subrepo.gitdir);
 
+	/* TODO: audit for interaction with sparse-index. */
+	ensure_full_index(subrepo.index);
 	for (i = 0; i < subrepo.index->cache_nr; i++) {
 		const struct cache_entry *ce = subrepo.index->cache[i];