diff --git a/modules/core/src/dom/element.js b/modules/core/src/dom/element.js
index f135bcb281..fccf7857bb 100644
--- a/modules/core/src/dom/element.js
+++ b/modules/core/src/dom/element.js
@@ -2,7 +2,7 @@ import {Element} from 'facade/dom';
 
 export class NgElement {
   domElement:Element;
-  constructor(domElement) {
+  constructor(domElement:Element) {
     this.domElement = domElement;
   }
 }
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