1 files changed, 1 insertions, 1 deletions
diff --git a/plugins/VisitsSummary/API.php b/plugins/VisitsSummary/API.php
index db4355203c..7dbabcf6d9 100644
--- a/plugins/VisitsSummary/API.php
+++ b/plugins/VisitsSummary/API.php
@@ -161,7 +161,7 @@ class Piwik_VisitsSummary_API
         $table = $this->getSumVisitsLength($idSite, $period, $date, $segment);
         if (is_object($table)) {
             $table->filter('ColumnCallbackReplace',
-                array('sum_visit_length', array('Piwik', 'getPrettyTimeFromSeconds')));
+                array('sum_visit_length', '\Piwik\Piwik::getPrettyTimeFromSeconds'));
         } else {
             $table = Piwik::getPrettyTimeFromSeconds($table);
         }