diff --git a/builtin/fetch.c b/builtin/fetch.c
index b5ad09d046..a41b892dcc 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -659,7 +659,7 @@ static int update_local_ref(struct ref *ref,
 
 		if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 		    (recurse_submodules != RECURSE_SUBMODULES_ON))
-			check_for_new_submodule_commits(ref->new_oid.hash);
+			check_for_new_submodule_commits(&ref->new_oid);
 		r = s_update_ref(msg, ref, 0);
 		format_display(display, r ? '!' : '*', what,
 			       r ? _("unable to update local ref") : NULL,
@@ -675,7 +675,7 @@ static int update_local_ref(struct ref *ref,
 		strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 		if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 		    (recurse_submodules != RECURSE_SUBMODULES_ON))
-			check_for_new_submodule_commits(ref->new_oid.hash);
+			check_for_new_submodule_commits(&ref->new_oid);
 		r = s_update_ref("fast-forward", ref, 1);
 		format_display(display, r ? '!' : ' ', quickref.buf,
 			       r ? _("unable to update local ref") : NULL,
@@ -690,7 +690,7 @@ static int update_local_ref(struct ref *ref,
 		strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 		if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 		    (recurse_submodules != RECURSE_SUBMODULES_ON))
-			check_for_new_submodule_commits(ref->new_oid.hash);
+			check_for_new_submodule_commits(&ref->new_oid);
 		r = s_update_ref("forced-update", ref, 1);
 		format_display(display, r ? '!' : '+', quickref.buf,
 			       r ? _("unable to update local ref") : _("forced update"),
diff --git a/submodule.c b/submodule.c
index 3200b7bb2b..5c5c18ec3d 100644
--- a/submodule.c
+++ b/submodule.c
@@ -821,14 +821,14 @@ static int add_sha1_to_array(const char *ref, const struct object_id *oid,
 	return 0;
 }
 
-void check_for_new_submodule_commits(unsigned char new_sha1[20])
+void check_for_new_submodule_commits(struct object_id *oid)
 {
 	if (!initialized_fetch_ref_tips) {
 		for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
 		initialized_fetch_ref_tips = 1;
 	}
 
-	sha1_array_append(&ref_tips_after_fetch, new_sha1);
+	sha1_array_append(&ref_tips_after_fetch, oid->hash);
 }
 
 static int add_sha1_to_argv(const unsigned char sha1[20], void *data)
diff --git a/submodule.h b/submodule.h
index c8a0c9cb29..9c32b28b12 100644
--- a/submodule.h
+++ b/submodule.h
@@ -58,7 +58,7 @@ extern void show_submodule_inline_diff(FILE *f, const char *path,
 		const char *del, const char *add, const char *reset,
 		const struct diff_options *opt);
 extern void set_config_fetch_recurse_submodules(int value);
-extern void check_for_new_submodule_commits(unsigned char new_sha1[20]);
+extern void check_for_new_submodule_commits(struct object_id *oid);
 extern int fetch_populated_submodules(const struct argv_array *options,
 			       const char *prefix, int command_line_option,
 			       int quiet, int max_parallel_jobs);