diff --git a/src/declaration/queue.js b/src/declaration/queue.js
index 9637917..db9ad46 100644
--- a/src/declaration/queue.js
+++ b/src/declaration/queue.js
@@ -172,7 +172,7 @@
 
   var customElementsPolyfill = !CustomElements.useNative;
 
-  if (!customElementsPolyfill) {
+  if (customElementsPolyfill) {
     document.addEventListener('WebComponentsReady', function() {
       CustomElements.ready = false;
     });