diff --git a/commit-graph.c b/commit-graph.c
index fc4a43b8d6..0aea7b2ae5 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -41,6 +41,9 @@
 #define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \
 			+ GRAPH_FANOUT_SIZE + the_hash_algo->rawsz)
 
+/* Remember to update object flag allocation in object.h */
+#define REACHABLE       (1u<<15)
+
 char *get_commit_graph_filename(const char *obj_dir)
 {
 	char *filename = xstrfmt("%s/info/commit-graph", obj_dir);
@@ -1030,11 +1033,11 @@ static void add_missing_parents(struct write_commit_graph_context *ctx, struct c
 {
 	struct commit_list *parent;
 	for (parent = commit->parents; parent; parent = parent->next) {
-		if (!(parent->item->object.flags & UNINTERESTING)) {
+		if (!(parent->item->object.flags & REACHABLE)) {
 			ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
 			oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid));
 			ctx->oids.nr++;
-			parent->item->object.flags |= UNINTERESTING;
+			parent->item->object.flags |= REACHABLE;
 		}
 	}
 }
@@ -1052,7 +1055,7 @@ static void close_reachable(struct write_commit_graph_context *ctx)
 		display_progress(ctx->progress, i + 1);
 		commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
 		if (commit)
-			commit->object.flags |= UNINTERESTING;
+			commit->object.flags |= REACHABLE;
 	}
 	stop_progress(&ctx->progress);
 
@@ -1089,7 +1092,7 @@ static void close_reachable(struct write_commit_graph_context *ctx)
 		commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
 
 		if (commit)
-			commit->object.flags &= ~UNINTERESTING;
+			commit->object.flags &= ~REACHABLE;
 	}
 	stop_progress(&ctx->progress);
 }
diff --git a/commit-reach.c b/commit-reach.c
index 3ea174788a..4ca7e706a1 100644
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -10,7 +10,6 @@
 #include "commit-reach.h"
 
 /* Remember to update object flag allocation in object.h */
-#define REACHABLE       (1u<<15)
 #define PARENT1		(1u<<16)
 #define PARENT2		(1u<<17)
 #define STALE		(1u<<18)
diff --git a/object.h b/object.h
index 0120892bbd..25f5ab3d54 100644
--- a/object.h
+++ b/object.h
@@ -68,7 +68,8 @@ struct object_array {
  * bisect.c:                                        16
  * bundle.c:                                        16
  * http-push.c:                                     16-----19
- * commit-reach.c:                                15-------19
+ * commit-graph.c:                                15
+ * commit-reach.c:                                  16-----19
  * sha1-name.c:                                              20
  * list-objects-filter.c:                                      21
  * builtin/fsck.c:           0--3
diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index ecabbe1616..4b60282689 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -583,6 +583,22 @@ test_expect_success 'fetch.writeCommitGraph' '
 	)
 '
 
+test_expect_success 'fetch.writeCommitGraph with submodules' '
+	git clone dups super &&
+	(
+		cd super &&
+		git submodule add "file://$TRASH_DIRECTORY/three" &&
+		git commit -m "add submodule"
+	) &&
+	git clone "super" super-clone &&
+	(
+		cd super-clone &&
+		rm -rf .git/objects/info &&
+		git -c fetch.writeCommitGraph=true fetch origin &&
+		test_path_is_file .git/objects/info/commit-graphs/commit-graph-chain
+	)
+'
+
 # configured prune tests
 
 set_config_tristate () {