diff --git a/trytond/model/fields/many2many.py b/trytond/model/fields/many2many.py
index 7816f26849..b1933ad517 100644
--- a/trytond/model/fields/many2many.py
+++ b/trytond/model/fields/many2many.py
@@ -90,7 +90,7 @@ class Many2Many(Field):
                 clause = [(self.origin, 'in', references)]
             else:
                 clause = [(self.origin, 'in', list(sub_ids))]
-            clause += [(self.target + '.id', '!=', None)]
+            clause += [(self.target, '!=', None)]
             relations.append(Relation.search(clause, order=order))
         relations = list(chain(*relations))