diff --git a/tryton/gui/window/view_form/view/list_gtk/parser.py b/tryton/gui/window/view_form/view/list_gtk/parser.py
index a0fcc6ec67..105fd98857 100644
--- a/tryton/gui/window/view_form/view/list_gtk/parser.py
+++ b/tryton/gui/window/view_form/view/list_gtk/parser.py
@@ -554,7 +554,7 @@ class M2O(Char):
                 domain=domain, parent=self.window)
         found = win.run()
         if found:
-            arg = ('model', relation, 'read', found[0], ['rec_name'],
+            args = ('model', relation, 'read', found[0], ['rec_name'],
                     context)
             try:
                 res = rpc.execute(*args)