diff --git a/mistral/actions/action_factory.py b/mistral/actions/action_factory.py
index 077e52ec0..438e744d6 100644
--- a/mistral/actions/action_factory.py
+++ b/mistral/actions/action_factory.py
@@ -19,7 +19,10 @@ def construct_action_class(action_class_str, attributes):
     # Rebuild action class and restore attributes.
     action_class = importutils.import_class(action_class_str)
 
-    for name, value in attributes.items():
-        setattr(action_class, name, value)
+    unique_action_class = type(
+        action_class.__name__,
+        (action_class,),
+        attributes
+    )
 
-    return action_class
+    return unique_action_class
diff --git a/mistral/tests/unit/actions/test_action_manager.py b/mistral/tests/unit/actions/test_action_manager.py
index 31a0b268e..5c6dc79d4 100644
--- a/mistral/tests/unit/actions/test_action_manager.py
+++ b/mistral/tests/unit/actions/test_action_manager.py
@@ -23,7 +23,7 @@ from mistral.tests import base
 LOG = logging.getLogger(__name__)
 
 
-class ActionFactoryTest(base.DbTestCase):
+class ActionManagerTest(base.DbTestCase):
     def test_register_standard_actions(self):
         action_list = a_m.get_registered_actions()
 
@@ -44,17 +44,24 @@ class ActionFactoryTest(base.DbTestCase):
         self._assert_single_item(action_list, name="glance.images_delete")
 
     def test_get_action_class(self):
-        self.assertEqual(std.EchoAction, a_m.get_action_class("std.echo"))
-        self.assertEqual(std.HTTPAction, a_m.get_action_class("std.http"))
-        self.assertEqual(
-            std.MistralHTTPAction,
-            a_m.get_action_class("std.mistral_http")
+        self.assertTrue(
+            issubclass(a_m.get_action_class("std.echo"), std.EchoAction)
         )
-        self.assertEqual(
-            std.SendEmailAction,
-            a_m.get_action_class("std.email")
+        self.assertTrue(
+            issubclass(a_m.get_action_class("std.http"), std.HTTPAction)
         )
-        self.assertEqual(
-            std.JavaScriptAction,
-            a_m.get_action_class("std.javascript")
+        self.assertTrue(
+            issubclass(
+                a_m.get_action_class("std.mistral_http"),
+                std.MistralHTTPAction
+            )
+        )
+        self.assertTrue(
+            issubclass(a_m.get_action_class("std.email"), std.SendEmailAction)
+        )
+        self.assertTrue(
+            issubclass(
+                a_m.get_action_class("std.javascript"),
+                std.JavaScriptAction
+            )
         )