diff --git a/core/server/web/api/v2/admin/middleware.js b/core/server/web/api/v2/admin/middleware.js
index 8242eec88b..818c864329 100644
--- a/core/server/web/api/v2/admin/middleware.js
+++ b/core/server/web/api/v2/admin/middleware.js
@@ -19,7 +19,7 @@ const notImplemented = function (req, res, next) {
         themes: ['POST']
     };
 
-    const match = req.url.match(/^\/(\w+)\//);
+    const match = req.url.match(/^\/(\w+)\/?/);
 
     if (match) {
         const entity = match[1];
diff --git a/core/test/acceptance/old/admin/key_authentication_spec.js b/core/test/acceptance/old/admin/key_authentication_spec.js
index 9697fc0bb5..d4ff4dc659 100644
--- a/core/test/acceptance/old/admin/key_authentication_spec.js
+++ b/core/test/acceptance/old/admin/key_authentication_spec.js
@@ -60,7 +60,7 @@ describe('Admin API V2 key authentication', function () {
         };
 
         return request
-            .post(localUtils.API.getApiQuery('posts'))
+            .post(localUtils.API.getApiQuery('posts/'))
             .set('Origin', config.get('url'))
             .set('Authorization', `Ghost ${localUtils.getValidAdminToken(localUtils.API.getApiQuery('posts'))}`)
             .send({
@@ -68,6 +68,6 @@ describe('Admin API V2 key authentication', function () {
             })
             .expect('Content-Type', /json/)
             .expect('Cache-Control', testUtils.cacheRules.private)
-            .expect(501);
+            .expect(201);
     });
 });