diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 1d1a8bed..174eb371 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -337,7 +337,13 @@ class Evaluator(object):
                 param_names = []
                 named_param_name = stmt.get_defined_names()[0]
                 for typ in self.eval_call(call):
-                    for param in typ.params:
+                    if isinstance(typ, er.Class):
+                        params = []
+                        for init_method in typ.py__getattribute__('__init__'):
+                            params += init_method.params
+                    else:
+                        params = typ.params
+                    for param in params:
                         if unicode(param.get_name()) == unicode(named_param_name):
                             param_names.append(param.get_name().names[-1])
                 return param_names
diff --git a/jedi/evaluate/representation.py b/jedi/evaluate/representation.py
index 14d19b27..410280b7 100644
--- a/jedi/evaluate/representation.py
+++ b/jedi/evaluate/representation.py
@@ -390,6 +390,9 @@ class Class(use_metaclass(CachedMetaClass, Wrapper)):
     def py__call__(self, evaluator, params):
         return [Instance(evaluator, self, params)]
 
+    def py__getattribute__(self, name):
+        return self._evaluator.find_types(self, name)
+
     def scope_names_generator(self, position=None, add_class_vars=True):
         def in_iterable(name, iterable):
             """ checks if the name is in the variable 'iterable'. """
diff --git a/test/test_api/test_api_classes.py b/test/test_api/test_api_classes.py
index 5eaa13c4..c197edd0 100644
--- a/test/test_api/test_api_classes.py
+++ b/test/test_api/test_api_classes.py
@@ -246,4 +246,6 @@ class TestGotoAssignments(TestCase):
         src = 'from threading import Thread; Thread(group=1)'
         n = names(src, references=True)[-1]
         assert n.name == 'group'
-        assert n.goto_assignments()
+        param_def = n.goto_assignments()[0]
+        assert param_def.name == 'group'
+        assert param_def.type == 'param'