diff --git a/jedi/evaluate/representation.py b/jedi/evaluate/representation.py
index 2a47c405..8f22e2af 100644
--- a/jedi/evaluate/representation.py
+++ b/jedi/evaluate/representation.py
@@ -212,7 +212,8 @@ class InstanceElement(use_metaclass(CachedMetaClass, pr.Base)):
 
     def get_decorated_func(self):
         """ Needed because the InstanceElement should not be stripped """
-        func = self.var.get_decorated_func(self.instance)
+        func = self.var.get_decorated_func()
+        func = InstanceElement(self._evaluator, self.instance, func)
         if func == self.var:
             return self
         return func
diff --git a/test/test_api/test_call_signatures.py b/test/test_api/test_call_signatures.py
index d13a3e7a..7ebf370f 100644
--- a/test/test_api/test_call_signatures.py
+++ b/test/test_api/test_call_signatures.py
@@ -157,4 +157,4 @@ class TestCallSignatures(TestCase):
         signatures = Script(s).call_signatures()
         assert len(signatures) == 1
         x = [p.get_code() for p in signatures[0].params]
-        assert x == ['*args']
+        assert x == ['*args\n']