diff --git a/wp-includes/atomlib.php b/wp-includes/atomlib.php
index c6f2f24750..4dcddc99cb 100644
--- a/wp-includes/atomlib.php
+++ b/wp-includes/atomlib.php
@@ -131,8 +131,8 @@ class AtomParser {
 
             if(!xml_parse($parser, $data, feof($fp))) {
                 trigger_error(sprintf(__('XML error: %s at line %d')."\n",
-                    xml_error_string(xml_get_error_code($xml_parser)),
-                    xml_get_current_line_number($xml_parser)));
+                    xml_error_string(xml_get_error_code($parser)),
+                    xml_get_current_line_number($parser)));
                 $ret = false;
                 break;
             }