diff --git a/tryton/tests/test_common_domain_parser.py b/tryton/tests/test_common_domain_parser.py
index e10e8877e4..4c847b3a94 100644
--- a/tryton/tests/test_common_domain_parser.py
+++ b/tryton/tests/test_common_domain_parser.py
@@ -1121,6 +1121,9 @@ class DomainParserTestCase(TestCase):
         self.assertEqual(list(dom.completion('')), ['Name: '])
         self.assertEqual(list(dom.completion(' ')), ['', 'Name: '])
         self.assertEqual(list(dom.completion('Name: foo or')), ['Name: foo'])
+        self.assertEqual(
+            list(dom.completion('Name: foo (Name: foo or N')),
+            ['Name: foo (Name: foo or Name: '])
 
     def test_completion_many2one(self):
         "Test completion many2one"