diff --git a/examples/with-app-directory/next-translate.d.ts b/examples/with-app-directory/next-translate.d.ts
index 870df3f..ed1185a 100644
--- a/examples/with-app-directory/next-translate.d.ts
+++ b/examples/with-app-directory/next-translate.d.ts
@@ -9,7 +9,9 @@ export interface TranslationsKeys {
   // Specify here all the namespaces you have...
 }
 
-export interface TranslateFunction<Namespace extends keyof TranslationsKeys>  {
+type TranslationNamespace = keyof TranslationsKeys;
+
+export interface TranslateFunction<Namespace extends TranslationNamespace>  {
   (
     key: TranslationsKeys[Namespace],
     ...rest: Tail<Parameters<Translate>>
@@ -17,19 +19,19 @@ export interface TranslateFunction<Namespace extends keyof TranslationsKeys>  {
   <T extends string>(template: TemplateStringsArray): string
 };
 
-export interface TypeSafeTranslate<Namespace extends keyof TranslationsKeys>
+export interface TypeSafeTranslate<Namespace extends TranslationNamespace>
   extends Omit<I18n, 't'> {
   t: TranslateFunction<Namespace>
 }
 
 declare module 'next-translate/useTranslation' {
   export default function useTranslation<
-    Namespace extends keyof TranslationsKeys
+    Namespace extends TranslationNamespace
   >(namespace: Namespace): TypeSafeTranslate<Namespace>
 }
 
 declare module 'next-translate/getT' {
   export default function getT<
-    Namespace extends keyof TranslationsKeys
+    Namespace extends TranslationNamespace
   >(locale?: string, namespace: Namespace): Promise<TranslateFunction<Namespace>>  
 }