diff --git a/frappy/properties.py b/frappy/properties.py
index a4736e0..910002d 100644
--- a/frappy/properties.py
+++ b/frappy/properties.py
@@ -143,6 +143,7 @@ class HasProperties(HasDescriptors):
                 try:
                     # try to apply bare value to Property
                     po.value = po.datatype.validate(value)
+                    setattr(cls, pn, po)  # replace bare value by updated Property
                 except BadValueError:
                     if callable(value):
                         raise ProgrammingError(f'method {cls.__name__}.{pn} collides with property of {base.__name__}') from None
diff --git a/test/test_properties.py b/test/test_properties.py
index 9bfc44d..6d62e67 100644
--- a/test/test_properties.py
+++ b/test/test_properties.py
@@ -148,6 +148,8 @@ def test_Property_override():
     o2 = co()
     assert o1.a == 1
     assert o2.a == 3
+    o2.setProperty('a', 4)
+    assert o2.a == 4
 
     with pytest.raises(ProgrammingError) as e:
         class cx(c):  # pylint: disable=unused-variable