diff --git a/x-pack/dev-tools/jest/setup/polyfills.js b/x-pack/dev-tools/jest/setup/polyfills.js
index 5ecee2e3ad0d35..822802f3dacb79 100644
--- a/x-pack/dev-tools/jest/setup/polyfills.js
+++ b/x-pack/dev-tools/jest/setup/polyfills.js
@@ -17,5 +17,7 @@ const MutationObserver = require('mutation-observer');
 Object.defineProperty(window, 'MutationObserver', { value: MutationObserver });
 
 require('whatwg-fetch');
-const URL = { createObjectURL: () => '' };
-Object.defineProperty(window, 'URL', { value: URL });
+
+if (!global.URL.hasOwnProperty('createObjectURL')) {
+  Object.defineProperty(global.URL, 'createObjectURL', { value: () => '' });
+}