diff --git a/src/routes/api/fonts.js b/src/routes/api/fonts.ts
similarity index 89%
rename from src/routes/api/fonts.js
rename to src/routes/api/fonts.ts
index d21db07c8..fc68dc920 100644
--- a/src/routes/api/fonts.js
+++ b/src/routes/api/fonts.ts
@@ -1,6 +1,7 @@
-const optionService = require('../../services/options');
+import { Request, Response } from 'express';
+import optionService = require('../../services/options');
 
-function getFontCss(req, res) {
+function getFontCss(req: Request, res: Response) {
     res.setHeader('Content-Type', 'text/css');
 
     if (!optionService.getOptionBool('overrideThemeFonts')) {
@@ -34,6 +35,6 @@ function getFontCss(req, res) {
     res.send(style);
 }
 
-module.exports = {
+export = {
     getFontCss
 };
diff --git a/src/routes/routes.js b/src/routes/routes.js
index fab432f58..21dbe6166 100644
--- a/src/routes/routes.js
+++ b/src/routes/routes.js
@@ -55,7 +55,7 @@ const similarNotesRoute = require('./api/similar_notes.js');
 const keysRoute = require('./api/keys.js');
 const backendLogRoute = require('./api/backend_log');
 const statsRoute = require('./api/stats.js');
-const fontsRoute = require('./api/fonts.js');
+const fontsRoute = require('./api/fonts');
 const etapiTokensApiRoutes = require('./api/etapi_tokens');
 const relationMapApiRoute = require('./api/relation-map');
 const otherRoute = require('./api/other.js');