diff --git a/tag-dropdown-widget.php b/tag-dropdown-widget.php
index ac2d802b2f9fe02322be93dbf4f63b3e2a839a67..97dbece6ccad6ae824d452e899edd34e5bfa35a6 100644
--- a/tag-dropdown-widget.php
+++ b/tag-dropdown-widget.php
@@ -331,7 +331,7 @@ class taxonomy_dropdown_widget extends WP_Widget {
 	/**
 	 * Class variables
 	 */
-	var $defaults = array(
+	private $defaults = array(
 		'title' => 'Tags'
 	);