diff --git a/slic/gui/widgets.py b/slic/gui/widgets.py
index d16bd840..3cdb8942 100644
--- a/slic/gui/widgets.py
+++ b/slic/gui/widgets.py
@@ -33,7 +33,7 @@ class ListDisplay(wx.ListBox):
 
     def __init__(self, parent, sequence):
         wx.ListBox.__init__(self, parent)
-        sequence = [str(i) for i in sequence]
+        sequence = sorted(str(i) for i in sequence)
         self.InsertItems(sequence, 0)