diff --git a/packages/router/src/router_config_loader.ts b/packages/router/src/router_config_loader.ts
index f2f922b1e8..08d28c777a 100644
--- a/packages/router/src/router_config_loader.ts
+++ b/packages/router/src/router_config_loader.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Compiler, InjectionToken, Injector, NgModuleFactory, NgModuleFactoryLoader, NgModuleRef, ɵstringify as stringify} from '@angular/core';
+import {Compiler, InjectionToken, Injector, NgModuleFactory, NgModuleFactoryLoader, NgModuleRef} from '@angular/core';
 import {Observable} from 'rxjs/Observable';
 import {fromPromise} from 'rxjs/observable/fromPromise';
 import {of } from 'rxjs/observable/of';
@@ -41,16 +41,7 @@ export class RouterConfigLoader {
 
       const module = factory.create(parentInjector);
 
-      const parentRoutes = new Set(flatten(parentInjector.get(ROUTES)));
-      const moduleRoutes =
-          flatten(module.injector.get(ROUTES)).filter(route => !parentRoutes.has(route));
-
-      if (moduleRoutes.length === 0) {
-        throw new Error(
-            `A lazy loaded module must define at least 1 route, but it seems like the '${stringify(factory.moduleType)}' module hasn't defined any. Have you imported RouterModule.forChild(ROUTES) in this module?`);
-      }
-
-      return new LoadedRouterConfig(moduleRoutes, module);
+      return new LoadedRouterConfig(flatten(module.injector.get(ROUTES)), module);
     });
   }
 
diff --git a/packages/router/test/integration.spec.ts b/packages/router/test/integration.spec.ts
index 89c5443ae4..adeab68c68 100644
--- a/packages/router/test/integration.spec.ts
+++ b/packages/router/test/integration.spec.ts
@@ -2750,27 +2750,6 @@ describe('Integration', () => {
              expect(fixture.nativeElement).toHaveText('lazy-loaded-parent [lazy-loaded-child]');
            })));
 
-    it(`should throw an error when lazy loaded module does not provide any routes`,
-       fakeAsync(inject(
-           [Router, Location, NgModuleFactoryLoader],
-           (router: Router, location: Location, loader: SpyNgModuleFactoryLoader) => {
-
-             @NgModule({})
-             class LazyLoadedModule {
-             }
-
-             loader.stubbedModules = {expected: LazyLoadedModule};
-
-             const fixture = createRoot(router, RootCmp);
-
-             router.resetConfig([{path: 'lazy', loadChildren: 'expected'}]);
-
-             router.navigateByUrl('/lazy');
-             expect(() => advance(fixture))
-                 .toThrowError(
-                     /A lazy loaded module must define at least 1 route, but it seems like the 'LazyLoadedModule' module hasn't defined any/);
-           })));
-
     it('should have 2 injector trees: module and element',
        fakeAsync(inject(
            [Router, Location, NgModuleFactoryLoader],