diff --git a/jedi/evaluate/dynamic.py b/jedi/evaluate/dynamic.py
index 49dbea1c..b57118b8 100644
--- a/jedi/evaluate/dynamic.py
+++ b/jedi/evaluate/dynamic.py
@@ -78,7 +78,7 @@ def search_params(evaluator, param):
                     pos = c.start_pos
                     scope = stmt.parent
 
-                    # this whole stuff is just to not execute certain parts
+                    # This whole stuff is just to not execute certain parts
                     # (speed improvement), basically we could just call
                     # ``eval_call_path`` on the call_path and it would
                     # also work.
diff --git a/jedi/evaluate/representation.py b/jedi/evaluate/representation.py
index b6bffa68..ba4afb0d 100644
--- a/jedi/evaluate/representation.py
+++ b/jedi/evaluate/representation.py
@@ -58,7 +58,7 @@ class Instance(use_metaclass(CachedMetaClass, Executed)):
             # compare the module path with the builtin name.
             self.var_args = iterable.check_array_instances(evaluator, self)
         else:
-            # need to execute the __init__ function, because the dynamic param
+            # Need to execute the __init__ function, because the dynamic param
             # searching needs it.
             with common.ignored(KeyError):
                 self.execute_subscope_by_name('__init__', self.var_args)
@@ -251,9 +251,14 @@ class InstanceElement(use_metaclass(CachedMetaClass, pr.Base)):
         return isinstance(self.var, cls)
 
     def py__call__(self, evaluator, params):
-        # TODO Why are CompiledObject and Instance even InstanceObjects?
+        # TODO Why is CompiledObject even an InstanceObject?
         if isinstance(self.var, (compiled.CompiledObject, Instance)):
-            return self.var.py__call__(evaluator, params)
+            try:
+                func = self.var.py__call__
+            except AttributeError:
+                return []
+            else:
+                return func(evaluator, params)
         else:
             return Function.py__call__(self, evaluator, params)
 
diff --git a/test/completion/decorators.py b/test/completion/decorators.py
index 1d055544..4165b22e 100644
--- a/test/completion/decorators.py
+++ b/test/completion/decorators.py
@@ -191,6 +191,18 @@ f()
 #? int()
 g()
 
+
+class X():
+    @str
+    def x(self):
+        pass
+
+    def y(self):
+        #? str()
+        self.x
+        #?
+        self.x()
+
 # -----------------
 # method decorators
 # -----------------