diff --git a/packages/schematics/angular/utility/ast-utils.ts b/packages/schematics/angular/utility/ast-utils.ts
index 906246e2f860..4f6dc3565aab 100644
--- a/packages/schematics/angular/utility/ast-utils.ts
+++ b/packages/schematics/angular/utility/ast-utils.ts
@@ -622,8 +622,8 @@ export function addRouteDeclarationToModule(
 
   // Check if the route declarations array is
   // an inlined argument of RouterModule or a standalone variable
-  if (routesArg.kind === ts.SyntaxKind.ArrayLiteralExpression) {
-    routesArr = routesArg as ts.ArrayLiteralExpression;
+  if (ts.isArrayLiteralExpression(routesArg)) {
+    routesArr = routesArg;
   } else {
     const routesVarName = routesArg.getText();
     let routesVar;
@@ -642,8 +642,8 @@ export function addRouteDeclarationToModule(
         `to router module at line ${line} in ${fileToAdd}`,
       );
     }
-    const arrExpr = findNodes(routesVar, ts.SyntaxKind.ArrayLiteralExpression).pop();
-    routesArr = arrExpr as ts.ArrayLiteralExpression;
+
+    routesArr = findNodes(routesVar, ts.SyntaxKind.ArrayLiteralExpression, 1)[0] as ts.ArrayLiteralExpression;
   }
 
   const occurencesCount = routesArr.elements.length;
diff --git a/packages/schematics/angular/utility/ast-utils_spec.ts b/packages/schematics/angular/utility/ast-utils_spec.ts
index 60a4958aa12f..0f82e4acf2d4 100644
--- a/packages/schematics/angular/utility/ast-utils_spec.ts
+++ b/packages/schematics/angular/utility/ast-utils_spec.ts
@@ -444,6 +444,41 @@ describe('ast utils', () => {
       );
     });
 
+    it('should add a route to the routes to the correct array when having guards', () => {
+      const moduleContent = `
+        import { BrowserModule } from '@angular/platform-browser';
+        import { NgModule } from '@angular/core';
+        import { AppComponent } from './app.component';
+
+        const routes = [
+          { path: 'foo', component: FooComponent, canLoad: [Guard] }
+        ];
+
+        @NgModule({
+          declarations: [
+            AppComponent
+          ],
+          imports: [
+            BrowserModule,
+            RouterModule.forRoot(routes)
+          ],
+          bootstrap: [AppComponent]
+        })
+        export class AppModule { }
+      `;
+
+      const source = getTsSource(modulePath, moduleContent);
+      const changes = addRouteDeclarationToModule(
+        source,
+        './src/app', `{ path: 'bar', component: BarComponent }`,
+      );
+      const output = applyChanges(modulePath, moduleContent, [changes]);
+      expect(output).toMatch(
+        // tslint:disable-next-line:max-line-length
+        /const routes = \[\r?\n?\s*{ path: 'foo', component: FooComponent, canLoad: \[Guard\] },\r?\n?\s*{ path: 'bar', component: BarComponent }\r?\n?\s*\]/,
+      );
+    });
+
     it('should add a route to the routes argument of RouteModule', () => {
       const moduleContent = `
         import { BrowserModule } from '@angular/platform-browser';