diff --git a/packages/core/src/render3/di.ts b/packages/core/src/render3/di.ts
index ee773a21a4..99cfaad77b 100644
--- a/packages/core/src/render3/di.ts
+++ b/packages/core/src/render3/di.ts
@@ -591,10 +591,7 @@ export const QUERY_READ_FROM_NODE =
     }) as any as QueryReadType<any>);
 
 /** A ref to a node's native element. */
-class ElementRef implements viewEngine_ElementRef {
-  readonly nativeElement: any;
-  constructor(nativeElement: any) { this.nativeElement = nativeElement; }
-}
+class ElementRef extends viewEngine_ElementRef {}
 
 /**
  * Creates a ViewContainerRef and stores it on the injector. Or, if the ViewContainerRef
@@ -660,12 +657,14 @@ export class NodeInjector implements Injector {
  * A ref to a container that enables adding and removing views from that container
  * imperatively.
  */
-class ViewContainerRef implements viewEngine_ViewContainerRef {
+class ViewContainerRef extends viewEngine_ViewContainerRef {
   private _viewRefs: viewEngine_ViewRef[] = [];
 
   constructor(
       private _lContainerNode: LContainerNode,
-      private _hostNode: LElementNode|LElementContainerNode|LContainerNode) {}
+      private _hostNode: LElementNode|LElementContainerNode|LContainerNode) {
+    super();
+  }
 
   get element(): ElementRef {
     const injector = getOrCreateNodeInjectorForNode(this._hostNode);
@@ -820,10 +819,12 @@ export function getInheritedFactory<T>(type: Type<any>): (type: Type<T>) => T {
   }
 }
 
-class TemplateRef<T> implements viewEngine_TemplateRef<T> {
+class TemplateRef<T> extends viewEngine_TemplateRef<T> {
   constructor(
       private _declarationParentView: LViewData, readonly elementRef: viewEngine_ElementRef,
-      private _tView: TView, private _renderer: Renderer3, private _queries: LQueries|null) {}
+      private _tView: TView, private _renderer: Renderer3, private _queries: LQueries|null) {
+    super();
+  }
 
   createEmbeddedView(context: T, containerNode?: LContainerNode, index?: number):
       viewEngine_EmbeddedViewRef<T> {
diff --git a/packages/core/test/bundling/todo/bundle.golden_symbols.json b/packages/core/test/bundling/todo/bundle.golden_symbols.json
index c7df91d937..8b1d82038d 100644
--- a/packages/core/test/bundling/todo/bundle.golden_symbols.json
+++ b/packages/core/test/bundling/todo/bundle.golden_symbols.json
@@ -209,6 +209,9 @@
   {
     "name": "_THROW_IF_NOT_FOUND"
   },
+  {
+    "name": "__extends"
+  },
   {
     "name": "__read"
   },
@@ -515,6 +518,9 @@
   {
     "name": "executePipeOnDestroys"
   },
+  {
+    "name": "extendStatics"
+  },
   {
     "name": "extractDirectiveDef"
   },
diff --git a/packages/core/test/render3/di_spec.ts b/packages/core/test/render3/di_spec.ts
index c266743e03..06a2b7abb0 100644
--- a/packages/core/test/render3/di_spec.ts
+++ b/packages/core/test/render3/di_spec.ts
@@ -804,7 +804,7 @@ describe('di', () => {
       class DirectiveSameInstance {
         value: boolean;
         constructor(elementRef: ElementRef, directive: Directive) {
-          this.value = elementRef === directive.elementRef;
+          this.value = (elementRef === directive.elementRef) && elementRef instanceof ElementRef;
         }
         static ngDirectiveDef = defineDirective({
           type: DirectiveSameInstance,