diff --git a/packages/core-service/src/core/auth/auth.controller.ts b/packages/core-service/src/core/auth/auth.controller.ts
index 4566aa9..697669b 100644
--- a/packages/core-service/src/core/auth/auth.controller.ts
+++ b/packages/core-service/src/core/auth/auth.controller.ts
@@ -45,7 +45,7 @@ export class AuthController {
 
     // Refresh-Token als HttpOnly Cookie setzen (NICHT im localStorage!)
     // Regel: Kein localStorage fuer Tokens
-    this.setRefreshTokenCookie(res, result.refreshToken);
+    this.setRefreshTokenCookie(res, result.refreshToken!);
 
     return {
       accessToken: result.accessToken,
diff --git a/packages/core-service/src/core/auth/auth.service.ts b/packages/core-service/src/core/auth/auth.service.ts
index f12c20f..cc5f937 100644
--- a/packages/core-service/src/core/auth/auth.service.ts
+++ b/packages/core-service/src/core/auth/auth.service.ts
@@ -21,7 +21,7 @@ interface TokenPair {
 
 interface LoginResponse {
   accessToken: string;
-  refreshToken: string;
+  refreshToken?: string;
   user: {
     id: string;
     email: string;