diff --git a/test/interface/test_filters.py b/test/interface/test_filters.py
index 11d48da..f5e0b2d 100644
--- a/test/interface/test_filters.py
+++ b/test/interface/test_filters.py
@@ -1356,7 +1356,7 @@ def test_json_contains_is_invalid_except_special_version(
             with pytest.raises(BadFilterFormat) as err:
                 apply_filters(query, filters)
 
-            assert str(err) == 'Operator `json_contains` not valid.'
+            assert err.value.args[0] == 'Operator `json_contains` not valid.'
 
     @pytest.mark.usefixtures('multiple_tils_inserted')
     def test_til_not_contains_value(