diff --git a/tryton/gui/window/win_export.py b/tryton/gui/window/win_export.py
index 5c9b2dca4e..e12e95a58d 100644
--- a/tryton/gui/window/win_export.py
+++ b/tryton/gui/window/win_export.py
@@ -371,7 +371,7 @@ class WinExport(object):
                             break
                         else:
                             iter = self.model1.iter_next(iter)
-                    
+
             if field not in self.fields_data:
                 continue
             self.model2.append((self.fields_data[field]['string'], field))