diff --git a/client-py/plotter.py b/client-py/plotter.py
index 4c5d64b..106e1fc 100644
--- a/client-py/plotter.py
+++ b/client-py/plotter.py
@@ -7,7 +7,7 @@
 
 if sys.version_info.major < 3:
   from Tkinter import *
-  import SimpleDialog as simpledialog
+  import tkSimpleDialog as simpledialog
 else:
   from tkinter import *
   import tkinter.simpledialog as simpledialog