diff --git a/dist/details-element-polyfill.js b/dist/details-element-polyfill.js
index 6f7f710..ee20b5a 100644
--- a/dist/details-element-polyfill.js
+++ b/dist/details-element-polyfill.js
@@ -1,5 +1,5 @@
 /*
-Details Element Polyfill 2.3.0
+Details Element Polyfill 2.3.1
 Copyright © 2019 Javan Makhmali
  */
 (function() {
@@ -109,7 +109,7 @@ Copyright © 2019 Javan Makhmali
         forEach.call(mutations, function(mutation) {
           var target = mutation.target, attributeName = mutation.attributeName;
           if (target.tagName == "DETAILS" && attributeName == "open") {
-            triggerToggle(toggle);
+            triggerToggle(target);
           }
         });
       }).observe(document.documentElement, {
diff --git a/package.json b/package.json
index 3b05cee..b9d2047 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "details-element-polyfill",
-  "version": "2.3.0",
+  "version": "2.3.1",
   "description": "HTML <details> element polyfill",
   "main": "dist/details-element-polyfill.js",
   "files": [