diff --git a/tests/unit/config/test_configtypes.py b/tests/unit/config/test_configtypes.py
index 360bb2ed9..5ce2a321f 100644
--- a/tests/unit/config/test_configtypes.py
+++ b/tests/unit/config/test_configtypes.py
@@ -1921,7 +1921,7 @@ class TestURLSegmentList:
             klass(none_ok=False).validate('')
 
     @pytest.mark.parametrize('val', [
-        'foo', 'bar', 'foo,bar', 'host,path,foo', 'host,host'
+        'foo', 'bar', 'foo,bar', 'host,path,foo', 'host,host', 'host,',
     ])
     def test_validate_invalid(self, klass, val):
         with pytest.raises(configexc.ValidationError):