diff --git a/configtool/heaterlist.py b/configtool/heaterlist.py
index 555b11a..7496f3f 100644
--- a/configtool/heaterlist.py
+++ b/configtool/heaterlist.py
@@ -57,7 +57,7 @@ class HeaterList(wx.ListCtrl):
             self.setRowValidity(i, flag)
 
     def OnItemSelected(self, event):
-        self.currentItem = event.m_itemIndex
+        self.currentItem = event.GetIndex()
         self.parent.setItemSelected(self.currentItem)
 
     def OnItemDeselected(self, event):
diff --git a/configtool/sensorlist.py b/configtool/sensorlist.py
index 91f124d..212357c 100644
--- a/configtool/sensorlist.py
+++ b/configtool/sensorlist.py
@@ -56,7 +56,7 @@ class SensorList(wx.ListCtrl):
             self.setRowValidity(i, flag)
 
     def OnItemSelected(self, event):
-        self.currentItem = event.m_itemIndex
+        self.currentItem = event.GetIndex()
         self.parent.setItemSelected(self.currentItem)
 
     def OnItemDeselected(self, event):