diff --git a/htdocs/core/class/stats.class.php b/htdocs/core/class/stats.class.php
index ae9a8e56e58..91d3d729c2f 100644
--- a/htdocs/core/class/stats.class.php
+++ b/htdocs/core/class/stats.class.php
@@ -236,7 +236,7 @@ abstract class Stats
 
 		$year = $startyear;
 		while ($year <= $endyear) {
-			$datay[$year] = $this->getAverageByMonth($year);
+			$datay[$year] = $this->_getAverageByMonth($year);
 			$year++;
 		}