diff --git a/packages/core/strapi/lib/types/factories.d.ts b/packages/core/strapi/lib/types/factories.d.ts
index a7cc3669ba..f716ed9670 100644
--- a/packages/core/strapi/lib/types/factories.d.ts
+++ b/packages/core/strapi/lib/types/factories.d.ts
@@ -30,7 +30,7 @@ type CollectionTypeRouterConfig = {
 
 type RouterConfig = {
   prefix?: string;
-  only: string[];
+  only?: string[];
   except?: string[];
   config: SingleTypeRouterConfig | CollectionTypeRouterConfig;
 };