diff --git a/includes/polling/ports.inc.php b/includes/polling/ports.inc.php
index 8cfaaa16ca..4855fdc120 100644
--- a/includes/polling/ports.inc.php
+++ b/includes/polling/ports.inc.php
@@ -641,6 +641,7 @@ foreach ($ports as $port) {
         }
 
         $port_descr_type = $port['port_descr_type'];
+        $ifName = $port['ifName'];
         $tags = compact('ifName', 'port_descr_type', 'rrd_name', 'rrd_def');
         rrdtool_data_update($device, 'ports', $tags, $fields);