diff --git a/tests/unit/config/test_configtypes_hypothesis.py b/tests/unit/config/test_configtypes_hypothesis.py
index a7ab043ef..fe7807c4a 100644
--- a/tests/unit/config/test_configtypes_hypothesis.py
+++ b/tests/unit/config/test_configtypes_hypothesis.py
@@ -56,3 +56,5 @@ def test_configtypes_hypothesis(klass, s):
         klass().validate(s)
     except configexc.ValidationError:
         pass
+    else:
+        klass().transform(s)