diff --git a/tryton/client.py b/tryton/client.py
index 6ff347c5f0..46f40ca6dd 100644
--- a/tryton/client.py
+++ b/tryton/client.py
@@ -18,6 +18,7 @@ if os.name == 'nt':
 import pygtk
 pygtk.require('2.0')
 import gtk
+gtk.gdk.threads_init()
 import logging
 
 import version