diff --git a/lib/core/public/run.js b/lib/core/public/run.js
index 1389734b91..3575f9a27d 100644
--- a/lib/core/public/run.js
+++ b/lib/core/public/run.js
@@ -105,7 +105,7 @@ axe.run = function (context, options, callback) {
 	let reject = noop;
 	let resolve = noop;
 
-	if (window.Promise && callback === noop) {
+	if (typeof Promise === 'function' && callback === noop) {
 		p = new Promise(function (_resolve, _reject) {
 			reject = _reject;
 			resolve = _resolve;
@@ -143,4 +143,4 @@ axe.run = function (context, options, callback) {
  	});
  
  	return p;
-};
\ No newline at end of file
+};