diff --git a/src/mibew/js/source/widget.js b/src/mibew/js/source/widget.js
index 79f1619f..583750b1 100644
--- a/src/mibew/js/source/widget.js
+++ b/src/mibew/js/source/widget.js
@@ -460,9 +460,9 @@ var Mibew = {};
      * Accept invitation and open chat window
      */
     Mibew.Invitation.accept = function() {
-        if (document.getElementById('mibewAgentButton')) {
+        if (document.getElementById('mibew-agent-button')) {
             Mibew.Invitation.trigger('accept');
-            document.getElementById('mibewAgentButton').onclick();
+            document.getElementById('mibew-agent-button').onclick();
             Mibew.Invitation.hide();
         }
     }
diff --git a/src/mibew/libs/classes/Mibew/Button/Generator/TextGenerator.php b/src/mibew/libs/classes/Mibew/Button/Generator/TextGenerator.php
index ad0acd44..c6811168 100644
--- a/src/mibew/libs/classes/Mibew/Button/Generator/TextGenerator.php
+++ b/src/mibew/libs/classes/Mibew/Button/Generator/TextGenerator.php
@@ -49,7 +49,7 @@ class TextGenerator extends AbstractGenerator
         $link = HTML5\html('a', $message);
 
         $link->setAttributes(array(
-            'id' => 'mibewAgentButton',
+            'id' => 'mibew-agent-button',
             'href' =>  str_replace('&', '&', $this->getChatUrl()),
             'target' => '_blank',
             'onclick' =>sprintf(