diff --git a/tests/javascripts/support/jest.setup.js b/tests/javascripts/support/jest.setup.js
index f0b3a55dc..60c29d760 100644
--- a/tests/javascripts/support/jest.setup.js
+++ b/tests/javascripts/support/jest.setup.js
@@ -1,16 +1,13 @@
 const fs = require('fs');
 const path = require('path');
 
-// Polyfill holes in JSDOM
-require('./polyfills.js');
-
 // Set up jQuery
 global.$ = global.jQuery = require('jquery');
 
 // tests/jest.setup.js
 global.io = jest.fn().mockReturnValue({
-    on: jest.fn(),
-    emit: jest.fn()
+  on: jest.fn(),
+  emit: jest.fn(),
 });
 
 // Load module code
diff --git a/tests/javascripts/support/setup.js b/tests/javascripts/support/setup.js
index 64334becf..027bd1700 100644
--- a/tests/javascripts/support/setup.js
+++ b/tests/javascripts/support/setup.js
@@ -1,9 +1,6 @@
 const fs = require('fs');
 const path = require('path');
 
-// Polyfill holes in JSDOM
-require('./polyfills.js');
-
 // Set up jQuery
 global.$ = global.jQuery = require('jquery');