diff --git a/aio/src/ie-polyfills.js b/aio/src/ie-polyfills.js
index f97391461d..83bd30af94 100644
--- a/aio/src/ie-polyfills.js
+++ b/aio/src/ie-polyfills.js
@@ -11,6 +11,7 @@ import 'core-js/es6/date';
 import 'core-js/es6/array';
 import 'core-js/es6/regexp';
 import 'core-js/es6/map';
+import 'core-js/es6/weak-map';
 import 'core-js/es6/set';
 
 /** IE10 and IE11 requires the following for NgClass support on SVG elements */