diff --git a/actions/apigroupshow.php b/actions/apigroupshow.php
index f9b960747b..aae4d249c3 100644
--- a/actions/apigroupshow.php
+++ b/actions/apigroupshow.php
@@ -96,7 +96,7 @@ class ApiGroupShowAction extends ApiPrivateAuthAction
 
         switch($this->format) {
         case 'xml':
-            $this->show_single_xml_group($this->group);
+            $this->showSingleXmlGroup($this->group);
             break;
         case 'json':
             $this->showSingleJsonGroup($this->group);