diff --git a/src/AllPlotWindow.cpp b/src/AllPlotWindow.cpp
index 204dd5951..93fd9cb68 100644
--- a/src/AllPlotWindow.cpp
+++ b/src/AllPlotWindow.cpp
@@ -324,7 +324,7 @@ AllPlotWindow::setEndSelection(double xValue, bool newInterval, QString name)
 
         RideFile tmpRide = RideFile();
 
-        QTreeWidgetItem *which = mainwindow->rideItem();
+        QTreeWidgetItem *which = mainWindow->rideItem();
         RideItem *ride = (RideItem*)which;
 
         double distance1 = -1;
@@ -393,7 +393,7 @@ AllPlotWindow::setEndSelection(double xValue, bool newInterval, QString name)
 
         if (newInterval) {
 
-            QTreeWidgetItem *allIntervals = (QTreeWidgetItem *)mainwindow->allIntervalItems();
+            QTreeWidgetItem *allIntervals = mainWindow->mutableIntervalItems();
             int count = allIntervals->childCount();
 
             // are we adjusting an existing interval? - if so delete it and readd it
@@ -406,7 +406,7 @@ AllPlotWindow::setEndSelection(double xValue, bool newInterval, QString name)
             allIntervals->addChild(last);
 
             // now update the RideFileIntervals and all the plots etc
-            mainwindow->updateRideFileIntervals();
+            mainWindow->updateRideFileIntervals();
         }
     }
 }
diff --git a/src/MainWindow.h b/src/MainWindow.h
index 0065eceb1..b520f177b 100644
--- a/src/MainWindow.h
+++ b/src/MainWindow.h
@@ -55,6 +55,7 @@ class MainWindow : public QMainWindow
         const RideItem *currentRideItem() { return ride; }
         const QTreeWidgetItem *allRideItems() { return allRides; }
         const QTreeWidgetItem *allIntervalItems() { return allIntervals; }
+        QTreeWidgetItem *mutableIntervalItems() { return allIntervals; }
 	void getBSFactors(float &timeBS, float &distanceBS);
         QDir home;
         void setCriticalPower(int cp);