diff --git a/client/src/polyfills.ts b/client/src/polyfills.ts
index bbba3f05c..d24bcb09d 100644
--- a/client/src/polyfills.ts
+++ b/client/src/polyfills.ts
@@ -19,6 +19,7 @@
 */
 
 import 'core-js/es/object'
+import 'core-js/es/global-this'
 
 /** IE10 and IE11 requires the following for NgClass support on SVG elements */
 // import 'classlist.js';  // Run `npm install --save classlist.js`.