diff --git a/packages/ember-environment/lib/global.js b/packages/ember-environment/lib/global.js
index 5ed0902ab6e..1ee27eb31ed 100644
--- a/packages/ember-environment/lib/global.js
+++ b/packages/ember-environment/lib/global.js
@@ -1,4 +1,4 @@
-/* globals global, window, self, mainContext */
+/* globals global, window, self */
 
 // from lodash to catch fake globals
 function checkGlobal(value) {
@@ -14,5 +14,4 @@ function checkElementIdShadowing(value) {
 export default checkGlobal(checkElementIdShadowing(typeof global === 'object' && global)) ||
                checkGlobal(typeof self === 'object' && self) ||
                checkGlobal(typeof window === 'object' && window) ||
-               mainContext || // set before strict mode in Ember loader/wrapper
                new Function('return this')(); // eval outside of strict mode