diff --git a/plot.h b/plot.h
--- a/plot.h
+++ b/plot.h
@@ -23,6 +23,7 @@
 #include <qwt_plot.h>
 #include <qwt_plot_grid.h>
 #include "zoomer.h"
+#include "scalepicker.h"
 
 class Plot : public QwtPlot
 {
@@ -37,6 +38,7 @@ private:
     double yMin, yMax;
     Zoomer zoomer;
     QwtPlotGrid grid;
+    ScalePicker scalePicker;
 
     void resetAxes();