diff --git a/ghost/admin/mirage/config/newsletters.js b/ghost/admin/mirage/config/newsletters.js
index 04e23c5750..8966761d84 100644
--- a/ghost/admin/mirage/config/newsletters.js
+++ b/ghost/admin/mirage/config/newsletters.js
@@ -1,4 +1,6 @@
 import {camelize} from '@ember/string';
+import {dasherize} from '@ember/string';
+import {isBlank} from '@ember/utils';
 import {paginatedResponse} from '../utils';
 
 export default function mockNewsletters(server) {
@@ -12,6 +14,10 @@ export default function mockNewsletters(server) {
         const senderEmail = attrs.senderEmail;
         attrs.senderEmail = null;
 
+        if (isBlank(attrs.slug) && !isBlank(attrs.name)) {
+            attrs.slug = dasherize(attrs.name);
+        }
+
         const newsletter = newsletters.create(attrs);
 
         // workaround for mirage output of meta
diff --git a/ghost/admin/tests/acceptance/settings/newsletters-test.js b/ghost/admin/tests/acceptance/settings/newsletters-test.js
index f1dc925188..b5f8a0ca19 100644
--- a/ghost/admin/tests/acceptance/settings/newsletters-test.js
+++ b/ghost/admin/tests/acceptance/settings/newsletters-test.js
@@ -153,7 +153,7 @@ describe('Acceptance: Settings - Newsletters', function () {
 
             await checkSave({});
 
-            expect(findAll('[data-test-newsletter]').length, 'Total newsletters shown').to.equal(2);
+            expect(findAll('[data-test-newsletter]').length, 'Total newsletters shown afterwards').to.equal(2);
         });
 
         it('validates create newsletter before saving', async function () {
@@ -174,7 +174,7 @@ describe('Acceptance: Settings - Newsletters', function () {
             // Everything should be valid
             await checkSave({});
 
-            expect(findAll('[data-test-newsletter]').length, 'Total newsletters shown').to.equal(2);
+            expect(findAll('[data-test-newsletter]').length, 'Total newsletters shown afterwards').to.equal(2);
         });
 
         it('checks limits when creating a newsletter', async function () {