diff --git a/commit-graph.h b/commit-graph.h
index c321834..802d352 100644
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -48,6 +48,7 @@ struct commit_graph {
 	uint32_t num_commits;
 	struct object_id oid;
 	char *filename;
+	const char *obj_dir;
 
 	uint32_t num_commits_in_base;
 	struct commit_graph *base_graph;