diff --git a/interface/lib/classes/simplepie.inc.php b/interface/lib/classes/simplepie.inc.php
index 6ddc0e089d2575ec85c9e8fe8d5c4416c3b0464f..697270f9e1119185e490814e76f6a2aadde3aed5 100644
--- a/interface/lib/classes/simplepie.inc.php
+++ b/interface/lib/classes/simplepie.inc.php
@@ -10865,7 +10865,7 @@ class SimplePie_Misc
 		return $output . $data;
 	}
 
-	function parse_date($dt)
+	static function parse_date($dt)
 	{
 		$parser = SimplePie_Parse_Date::get();
 		return $parser->parse($dt);
@@ -13065,7 +13065,7 @@ class SimplePie_Parse_Date
 	 *
 	 * @access public
 	 */
-	function get()
+	static function get()
 	{
 		static $object;
 		if (!$object)