diff --git a/t/helper/test-repository.c b/t/helper/test-repository.c
index c6a074df3d..63c37de33d 100644
--- a/t/helper/test-repository.c
+++ b/t/helper/test-repository.c
@@ -19,7 +19,7 @@ static void test_parse_commit_in_graph(const char *gitdir, const char *worktree,
 
 	setup_git_env(gitdir);
 
-	memset(the_repository, 0, sizeof(*the_repository));
+	repo_clear(the_repository);
 
 	if (repo_init(&r, gitdir, worktree))
 		die("Couldn't init repo");
@@ -49,7 +49,7 @@ static void test_get_commit_tree_in_graph(const char *gitdir,
 
 	setup_git_env(gitdir);
 
-	memset(the_repository, 0, sizeof(*the_repository));
+	repo_clear(the_repository);
 
 	if (repo_init(&r, gitdir, worktree))
 		die("Couldn't init repo");
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index a2b4442660..2916c07e3c 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='commit graph'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-chunk.sh