diff --git a/defaultConfig.stub.js b/defaultConfig.stub.js
index d2e5ab7f8277..4f1349cd1850 100644
--- a/defaultConfig.stub.js
+++ b/defaultConfig.stub.js
@@ -399,7 +399,7 @@ module.exports = {
   |
   */
 
-  borderColors: Object.assign({ default: colors['grey-light'] }, colors),
+  borderColors: global.Object.assign({ default: colors['grey-light'] }, colors),
 
 
   /*