diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index c88389df24..c527a8369e 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -311,6 +311,7 @@ cleanup:
 	FREE_AND_NULL(options);
 	string_list_clear(&pack_indexes, 0);
 	strbuf_release(&buf);
+	oidset_clear(&commits);
 	return result;
 }
 
diff --git a/t/t5324-split-commit-graph.sh b/t/t5324-split-commit-graph.sh
index 36c4141e67..52e8a3e619 100755
--- a/t/t5324-split-commit-graph.sh
+++ b/t/t5324-split-commit-graph.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='split commit graph'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 GIT_TEST_COMMIT_GRAPH=0