diff --git a/src/plot.h b/src/plot.h
--- a/src/plot.h
+++ b/src/plot.h
@@ -57,6 +57,7 @@ private:
     QAction showMinorGridAction;
     QAction unzoomAction;
     QAction darkBackgroundAction;
+    QAction showLegendAction;
 
     void resetAxes();