diff --git a/libraries/cms/html/behavior.php b/libraries/cms/html/behavior.php
index 7c7d6ea7b5795..946a85b365d7c 100644
--- a/libraries/cms/html/behavior.php
+++ b/libraries/cms/html/behavior.php
@@ -883,9 +883,13 @@ protected static function _getJSObject($array = array())
 	 * @return  void
 	 *
 	 * @since   3.2
+	 *
+	 * @deprecated 4.0 In Joomla 4 use the custom element joomla-tab.
 	 */
 	public static function tabstate()
 	{
+		JLog::add('JHtmlBehavior::tabstate is deprecated. In Joomla 4 use the custom element joomla-tab.', JLog::WARNING, 'deprecated');
+
 		if (isset(self::$loaded[__METHOD__]))
 		{
 			return;