diff --git a/builtin/commit.c b/builtin/commit.c
index bda6afc..92b7e8c 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -719,7 +719,7 @@ static void prepare_amend_commit(struct commit *commit, struct strbuf *sb,
 	 * duplicate the subject line.
 	 */
 	fmt = starts_with(subject, "amend!") ? "%b" : "%B";
-	format_commit_message(commit, fmt, sb, ctx);
+	repo_format_commit_message(the_repository, commit, fmt, sb, ctx);
 	repo_unuse_commit_buffer(the_repository, commit, buffer);
 }
 
@@ -760,8 +760,9 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 			if (!c)
 				die(_("could not lookup commit %s"), squash_message);
 			ctx.output_encoding = get_commit_output_encoding();
-			format_commit_message(c, "squash! %s\n\n", &sb,
-					      &ctx);
+			repo_format_commit_message(the_repository, c,
+						   "squash! %s\n\n", &sb,
+						   &ctx);
 		}
 	}
 
@@ -795,7 +796,8 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 			die(_("could not lookup commit %s"), fixup_commit);
 		ctx.output_encoding = get_commit_output_encoding();
 		fmt = xstrfmt("%s! %%s\n\n", fixup_prefix);
-		format_commit_message(commit, fmt, &sb, &ctx);
+		repo_format_commit_message(the_repository, commit, fmt, &sb,
+					   &ctx);
 		free(fmt);
 		hook_arg1 = "message";
 
@@ -1135,7 +1137,8 @@ static const char *find_author_by_nickname(const char *name)
 		struct pretty_print_context ctx = {0};
 		ctx.date_mode.type = DATE_NORMAL;
 		strbuf_release(&buf);
-		format_commit_message(commit, "%aN <%aE>", &buf, &ctx);
+		repo_format_commit_message(the_repository, commit,
+					   "%aN <%aE>", &buf, &ctx);
 		release_revisions(&revs);
 		return strbuf_detach(&buf, NULL);
 	}