diff --git a/npm/ng-packs/packages/core/src/lib/models/environment.ts b/npm/ng-packs/packages/core/src/lib/models/environment.ts
index a397918631..85a776a693 100644
--- a/npm/ng-packs/packages/core/src/lib/models/environment.ts
+++ b/npm/ng-packs/packages/core/src/lib/models/environment.ts
@@ -23,7 +23,7 @@ export interface HasAdditional {
 }
 export interface ApiConfig extends O.Partial<HasAdditional> {
   url: string;
-  rootNamespace: string;
+  rootNamespace?: string;
 }
 
 export interface Apis {