diff --git a/npm/ng-packs/packages/core/src/lib/services/http-error-reporter.service.ts b/npm/ng-packs/packages/core/src/lib/services/http-error-reporter.service.ts
index f07c5db9ee..f43c114c8b 100644
--- a/npm/ng-packs/packages/core/src/lib/services/http-error-reporter.service.ts
+++ b/npm/ng-packs/packages/core/src/lib/services/http-error-reporter.service.ts
@@ -19,7 +19,7 @@ export class HttpErrorReporterService {
     return this._errors$.value;
   }
 
-  reportError = (error: HttpErrorResponse) => {
+  reportError(error: HttpErrorResponse) {
     this._reporter$.next(error);
     this._errors$.next([...this.errors, error]);
   }
diff --git a/npm/ng-packs/packages/core/src/lib/tests/permission.guard.spec.ts b/npm/ng-packs/packages/core/src/lib/tests/permission.guard.spec.ts
index 6464f76a66..b6dbc7b1d9 100644
--- a/npm/ng-packs/packages/core/src/lib/tests/permission.guard.spec.ts
+++ b/npm/ng-packs/packages/core/src/lib/tests/permission.guard.spec.ts
@@ -134,7 +134,7 @@ describe('authGuard', () => {
     hasValidAccessToken: jest.fn().mockReturnValue(true),
   };
 
-  let routes: Route[] = [
+  const routes: Route[] = [
     {
       path: 'dummy',
       component: DummyComponent,
diff --git a/npm/ng-packs/packages/oauth/src/lib/tests/auth.guard.spec.ts b/npm/ng-packs/packages/oauth/src/lib/tests/auth.guard.spec.ts
index 47f57bc50c..e8a0f2dbf0 100644
--- a/npm/ng-packs/packages/oauth/src/lib/tests/auth.guard.spec.ts
+++ b/npm/ng-packs/packages/oauth/src/lib/tests/auth.guard.spec.ts
@@ -51,7 +51,7 @@ class DummyComponent {}
 describe('authGuard', () => {
   let oAuthService: SpyObject<OAuthService>; 
   let authService: SpyObject<AuthService>;
-  let routes: Route[] = [
+  const routes: Route[] = [
     {
       path: 'dummy',
       canActivate: [abpOAuthGuard],