diff --git a/core/server/web/api/v3/admin/middleware.js b/core/server/web/api/v3/admin/middleware.js
index 0b64dab04f..c7a277659a 100644
--- a/core/server/web/api/v3/admin/middleware.js
+++ b/core/server/web/api/v3/admin/middleware.js
@@ -1,9 +1,13 @@
 const errors = require('@tryghost/errors');
-const i18n = require('../../../../../shared/i18n');
+const tpl = require('@tryghost/tpl');
 const auth = require('../../../../services/auth');
 const shared = require('../../../shared');
 const apiMw = require('../../middleware');
 
+const messages = {
+    notImplemented: 'The server does not support the functionality required to fulfill the request.'
+};
+
 const notImplemented = function (req, res, next) {
     // CASE: user is logged in, allow
     if (!req.api_key) {
@@ -42,7 +46,7 @@ const notImplemented = function (req, res, next) {
 
     next(new errors.GhostError({
         errorType: 'NotImplementedError',
-        message: i18n.t('errors.api.common.notImplemented'),
+        message: tpl(messages.notImplemented),
         statusCode: '501'
     }));
 };