diff --git a/backend/src/middleware/slugify/uniqueSlug.js b/backend/src/middleware/slugify/uniqueSlug.js
index abab3851a..e547db124 100644
--- a/backend/src/middleware/slugify/uniqueSlug.js
+++ b/backend/src/middleware/slugify/uniqueSlug.js
@@ -2,7 +2,7 @@ import slugify from 'slug'
 export default async function uniqueSlug(string, isUnique) {
   const slug = slugify(string || 'anonymous', {
     lower: true,
-    locale: 'de',
+    charmap: { Ä: 'AE', ä: 'ae', Ö: 'OE', ö: 'oe', Ü: 'UE', ü: 'ue', ñ: 'n' },
   })
   if (await isUnique(slug)) return slug
 
diff --git a/backend/src/middleware/slugify/uniqueSlug.spec.js b/backend/src/middleware/slugify/uniqueSlug.spec.js
index 842dffe2c..e0d9a256f 100644
--- a/backend/src/middleware/slugify/uniqueSlug.spec.js
+++ b/backend/src/middleware/slugify/uniqueSlug.spec.js
@@ -18,18 +18,17 @@ describe('uniqueSlug', () => {
     const isUnique = jest.fn().mockResolvedValue(true)
     expect(uniqueSlug(string, isUnique)).resolves.toEqual('anonymous')
   })
-})
-
-describe('Slug is transliterated correctly', () => {
-  it('Converts umlaut to a two letter equivalent', () => {
+  
+  it('Converts umlaut to a two letter equivalent', async () => {
     const umlaut = 'ä'
     const isUnique = jest.fn().mockResolvedValue(true)
-    expect(uniqueSlug(umlaut, isUnique)).resolves.toEqual('ae')
+    await expect(uniqueSlug(umlaut, isUnique)).resolves.toEqual('ae')
   })
 
-  it('Removes Spanish enya ', () => {
+  it('Removes Spanish enya ', async () => {
     const enya = 'ñ'
     const isUnique = jest.fn().mockResolvedValue(true)
-    expect(uniqueSlug(enya, isUnique)).resolves.toEqual('n')
+    await expect(uniqueSlug(enya, isUnique)).resolves.toEqual('n')
   })
 })
+