diff --git a/src/ui/linechart/IncrementalPlot.cc b/src/ui/linechart/IncrementalPlot.cc
index 6eeb5dd5a3ec4e3d41ef741e54828c38d9299762..7a99b9119a81064f2e6ccb4567124a1b50002b29 100644
--- a/src/ui/linechart/IncrementalPlot.cc
+++ b/src/ui/linechart/IncrementalPlot.cc
@@ -173,7 +173,7 @@ void IncrementalPlot::setStyleText(QString style)
                                        Qt::NoBrush, QPen(QBrush(curve->symbol().pen().color()), symbolWidth), QSize(6, 6)) );
         }
 
-        curve->setPen(QPen(QBrush(curve->symbol().pen().color().darker()), curveWidth));
+        curve->setPen(QPen(QBrush(curve->symbol().pen().color()), curveWidth));
         // Style of lines
         if (style.toLower().contains("dotted")) {
             curve->setStyle(QwtPlotCurve::Dots);