diff --git a/packfile.c b/packfile.c
index 8668345d930..b79cbc8cd47 100644
--- a/packfile.c
+++ b/packfile.c
@@ -2247,6 +2247,7 @@ static int add_promisor_object(const struct object_id *oid,
 			return 0;
 		while (tree_entry_gently(&desc, &entry))
 			oidset_insert(set, &entry.oid);
+		free_tree_buffer(tree);
 	} else if (obj->type == OBJ_COMMIT) {
 		struct commit *commit = (struct commit *) obj;
 		struct commit_list *parents = commit->parents;
diff --git a/t/perf/p5600-partial-clone.sh b/t/perf/p5600-partial-clone.sh
index 3e04bd2ae1d..754aaec3dc1 100755
--- a/t/perf/p5600-partial-clone.sh
+++ b/t/perf/p5600-partial-clone.sh
@@ -23,4 +23,8 @@ test_perf 'checkout of result' '
 	git -C worktree checkout -f
 '
 
+test_perf 'fsck' '
+	git -C bare.git fsck
+'
+
 test_done