diff --git a/plugins/CustomVariables/Reports/GetCustomVariables.php b/plugins/CustomVariables/Reports/GetCustomVariables.php
index 7872962820b015e7a596c9bdfc8ac8372c227b87..b4e133c7e377d773131c02193b5a96fb1bbaa344 100644
--- a/plugins/CustomVariables/Reports/GetCustomVariables.php
+++ b/plugins/CustomVariables/Reports/GetCustomVariables.php
@@ -48,7 +48,7 @@ class GetCustomVariables extends Base
     /**
      * @return array
      */
-    protected function getFooterMessageExplanationMissingMetrics()
+    public function getFooterMessageExplanationMissingMetrics()
     {
         $metrics = sprintf("'%s', '%s' %s '%s'",
             Piwik::translate('General_ColumnNbVisits'),