diff --git a/lib/HTMLUtils.php b/lib/HTMLUtils.php
index 9f09723..09a960d 100644
--- a/lib/HTMLUtils.php
+++ b/lib/HTMLUtils.php
@@ -133,8 +133,8 @@ class HTMLSanitizer {
 	var $keptAttributes;
 	var $onlyKeepText;
 
-	const DEFAULT_CLEAR_TAGS = ["script", "iframe"];
-	const KEPT_ATTRIBUTES = ["title", "href", "src"];
+	public static $DEFAULT_CLEAR_TAGS = ["script", "iframe"];
+	public static $KEPT_ATTRIBUTES = ["title", "href", "src"];
 
 	const ONLY_TEXT = null;