diff --git a/docs/source/changelog.rst b/docs/source/changelog.rst
index 5f24d253..d4bc1b99 100644
--- a/docs/source/changelog.rst
+++ b/docs/source/changelog.rst
@@ -2,6 +2,15 @@
 Change Log
 **********
 
+**Pyro 4.74**
+
+- fixed marshal serializer dumpsCall to be able to use the
+  class_to_dict conversion for unmarshallable types (in simple situations, not recursively).
+  This makes it possible again to use the marshal
+  serializer to register objects with the name server, something basic that
+  previously resulted in a ValueError: unmarshallable object.
+
+
 **Pyro 4.73**
 
 - include LICENSE file in distribution
diff --git a/src/Pyro4/constants.py b/src/Pyro4/constants.py
index ae16a526..72e624ca 100644
--- a/src/Pyro4/constants.py
+++ b/src/Pyro4/constants.py
@@ -5,7 +5,7 @@
 """
 
 # Pyro version
-VERSION = "4.73"
+VERSION = "4.74.dev0"
 
 # standard object name for the Daemon object
 DAEMON_NAME = "Pyro.Daemon"
diff --git a/src/Pyro4/util.py b/src/Pyro4/util.py
index f5c5b33b..09a410fd 100644
--- a/src/Pyro4/util.py
+++ b/src/Pyro4/util.py
@@ -532,6 +532,8 @@ class MarshalSerializer(SerializerBase):
     serializer_id = 3  # never change this
 
     def dumpsCall(self, obj, method, vargs, kwargs):
+        vargs = [self.convert_obj_into_marshallable(value) for value in vargs]
+        kwargs = {key: self.convert_obj_into_marshallable(value) for key, value in kwargs.items()}
         return marshal.dumps((obj, method, vargs, kwargs))
 
     def dumps(self, data):
@@ -567,6 +569,14 @@ def loads(self, data):
             data = self._convertToBytes(data)
             return self.recreate_classes(marshal.loads(data))
 
+    def convert_obj_into_marshallable(self, obj):
+        marshalable_types = {str, int, float, type(None), bool, complex, bytes, bytearray, tuple, set, frozenset, list, dict}
+        if sys.version_info < (3, 0):
+            marshalable_types.add(unicode)
+        if type(obj) in marshalable_types:
+            return obj
+        return self.class_to_dict(obj)
+
     @classmethod
     def class_to_dict(cls, obj):
         if isinstance(obj, uuid.UUID):
diff --git a/src/Pyro4/utils/httpgateway.py b/src/Pyro4/utils/httpgateway.py
index 55b83c43..6aa338fd 100644
--- a/src/Pyro4/utils/httpgateway.py
+++ b/src/Pyro4/utils/httpgateway.py
@@ -117,7 +117,8 @@ def redirect(start_response, target):
     <a href="http://pyro4.readthedocs.io/en/stable/tipstricks.html#pyro-via-http-and-json">Docs.</a>
 </p>
 </div>
-<p><em>Note: performance isn't a key concern here; it is a stateless server. It does a name lookup and uses a new Pyro proxy for each request.</em></p>
+<p><em>Note: performance isn't a key concern here; it is a stateless server.
+ It does a name lookup and uses a new Pyro proxy for each request.</em></p>
 <h2>Currently exposed contents of name server on {hostname}:</h2>
 <p>(Limited to 10 entries, exposed name pattern = '{ns_regex}')</p>
 {name_server_contents_list}
diff --git a/tests/PyroTests/test_serialize.py b/tests/PyroTests/test_serialize.py
index 9de227be..bd9f64a3 100644
--- a/tests/PyroTests/test_serialize.py
+++ b/tests/PyroTests/test_serialize.py
@@ -398,13 +398,15 @@ def testCircular(self):
         self.assertEqual(42, data2[0])
 
     def testCallPlain(self):
-        ser, compressed = self.ser.serializeCall("object", "method", "vargs", "kwargs")
+        ser, compressed = self.ser.serializeCall("object", "method", ("vargs1", "vargs2"), {"kwargs": 999})
         self.assertFalse(compressed)
         obj, method, vargs, kwargs = self.ser.deserializeCall(ser, compressed=False)
         self.assertEqual("object", obj)
         self.assertEqual("method", method)
-        self.assertEqual("vargs", vargs)
-        self.assertEqual("kwargs", kwargs)
+        self.assertTrue(len(vargs) == 2)
+        self.assertTrue(vargs[0] == "vargs1")
+        self.assertTrue(vargs[1] == "vargs2")
+        self.assertDictEqual({"kwargs": 999}, kwargs)
 
     def testCallPyroObjAsArg(self):
         if self.SERIALIZER == "marshal":
@@ -575,6 +577,16 @@ def testSourceByteTypes_loads_memoryview(self):
         d = self.ser.loads(memoryview(ser))
         self.assertEqual([4, 5, 6], d)
 
+    def testSerializeDumps(self):
+        self.ser.dumps(uuid.uuid4())
+        self.ser.dumps(Pyro4.URI("PYRO:test@test:4444"))
+        self.ser.dumps(Pyro4.Proxy("PYRONAME:foobar"))
+        self.ser.dumpsCall("obj", "method", (1, 2, 3), {"arg1": 999})
+        self.ser.dumpsCall("obj", "method", (1, 2, Pyro4.URI("PYRO:test@test:4444")), {"arg1": 999})
+        self.ser.dumpsCall("obj", "method", (1, 2, Pyro4.URI("PYRO:test@test:4444")), {"arg1": Pyro4.URI("PYRO:test@test:4444")})
+        self.ser.dumpsCall("obj", "method", (1, 2, Pyro4.Proxy("PYRONAME:foobar")), {"arg1": 999})
+        self.ser.dumpsCall("obj", "method", (1, 2, Pyro4.Proxy("PYRONAME:foobar")), {"arg1": Pyro4.Proxy("PYRONAME:foobar")})
+
 
 class SerializeTests_cloudpickle(SerializeTests_pickle):
     SERIALIZER = "cloudpickle"