diff --git a/src/www/widgets/widgets/traffic_graphs.widget.php b/src/www/widgets/widgets/traffic_graphs.widget.php
index 47c2d9230..1101e96cf 100644
--- a/src/www/widgets/widgets/traffic_graphs.widget.php
+++ b/src/www/widgets/widgets/traffic_graphs.widget.php
@@ -96,7 +96,7 @@
       // load data
       traffic_graph_widget_chart_data_in.datum(chart_data_in).transition().duration(500).call(traffic_graph_widget_chart_in);
       if (traffic_graph_widget_chart_data_out !== null) {
-	traffic_graph_widget_chart_data_out.datum(chart_data_out).transition().duration(500).call(traffic_graph_widget_chart_out);
+          traffic_graph_widget_chart_data_out.datum(chart_data_out).transition().duration(500).call(traffic_graph_widget_chart_out);
       }
 
       // set selection