diff --git a/tryton/gui/window/view_form/view/form_gtk/dictionary.py b/tryton/gui/window/view_form/view/form_gtk/dictionary.py
index d660ca29fb..fba6ea1c9e 100644
--- a/tryton/gui/window/view_form/view/form_gtk/dictionary.py
+++ b/tryton/gui/window/view_form/view/form_gtk/dictionary.py
@@ -83,7 +83,7 @@ class DictSelectionEntry(DictEntry):
         widget.child.connect('focus-out-event',
             lambda w, e: self.parent_widget._focus_out())
         widget.child.connect('activate',
-            lambda w, e: self.parent_widget._focus_out())
+            lambda w: self.parent_widget._focus_out())
         widget.connect('notify::active',
             lambda w, e: self.parent_widget._focus_out())