diff --git a/test/function/conditional-definition/env.js b/test/function/conditional-definition/env.js
index d35efdb..dd7c175 100644
--- a/test/function/conditional-definition/env.js
+++ b/test/function/conditional-definition/env.js
@@ -1,4 +1,4 @@
-let env;
+var env;
 
 if ( typeof window !== 'undefined' ) {
 	env = function () {