diff --git a/pysollib/macosx/appSupport.py b/pysollib/macosx/appSupport.py
index 4ae80bbd..2cfe794f 100644
--- a/pysollib/macosx/appSupport.py
+++ b/pysollib/macosx/appSupport.py
@@ -25,7 +25,7 @@ A number of function that enhance PySol on MacOSX when it used as a normal
 GUI application (as opposed to an X11 application).
 """
 import sys
-from Tkinter import TclError
+from six.moves.tkinter import TclError
 
 
 def runningAsOSXApp():