diff --git a/src/wp-includes/atomlib.php b/src/wp-includes/atomlib.php
index 90f6282243cfe..91407cb98709e 100644
--- a/src/wp-includes/atomlib.php
+++ b/src/wp-includes/atomlib.php
@@ -86,6 +86,10 @@ class AtomParser {
 
     var $feed;
     var $current;
+    var $map_attrs_func;
+    var $map_xmlns_func;
+    var $error;
+    var $content;
 
 	/**
 	 * PHP5 constructor.