diff --git a/html/includes/print-device-graph.php b/html/includes/print-device-graph.php
index eb43a59c7..2377194f9 100644
--- a/html/includes/print-device-graph.php
+++ b/html/includes/print-device-graph.php
@@ -13,5 +13,7 @@ include("includes/print-quadgraphs.inc.php");
 
 echo('</div>');
 
+$g_i++;
+
 ?>