diff --git a/src/wp-includes/atomlib.php b/src/wp-includes/atomlib.php
index 4ec562c64b..368015adb1 100644
--- a/src/wp-includes/atomlib.php
+++ b/src/wp-includes/atomlib.php
@@ -159,7 +159,7 @@ class AtomParser {
 
     function start_element($parser, $name, $attrs) {
 
-        $tag = array_pop(split(":", $name));
+        $tag = array_pop(explode(":", $name));
 
         switch($name) {
             case $this->NS . ':feed':
@@ -238,7 +238,7 @@ class AtomParser {
 
     function end_element($parser, $name) {
 
-        $tag = array_pop(split(":", $name));
+        $tag = array_pop(explode(":", $name));
 
         $ccount = count($this->in_content);