diff --git a/src/InfluxDB/ResultSet.php b/src/InfluxDB/ResultSet.php
index 39516a978..fc86db88f 100644
--- a/src/InfluxDB/ResultSet.php
+++ b/src/InfluxDB/ResultSet.php
@@ -59,8 +59,9 @@ class ResultSet
     public function getPoints($metricName = '', array $tags = array())
     {
         $points = array();
+        $series = $this->getSeries();
 
-        foreach ($this->getSeries() as $serie) {
+        foreach ($series as $serie) {
 
             if ((empty($metricName) && empty($tags)
                 || $serie['name'] == $metricName