diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index aa40176b..46cf4247 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -542,8 +542,6 @@ class Script(object):
             origins = cache.cache_call_signatures(_callable, user_stmt)
         debug.speed('func_call followed')
 
-        print([classes.CallSignature(self._evaluator, o, call, index)
-                for o in origins])
         return [classes.CallSignature(self._evaluator, o, call, index)
                 for o in origins if o.is_callable()]
 
diff --git a/jedi/api/classes.py b/jedi/api/classes.py
index 52ead9f7..5fd11d4a 100644
--- a/jedi/api/classes.py
+++ b/jedi/api/classes.py
@@ -298,11 +298,10 @@ class BaseDefinition(object):
         if isinstance(stripped, pr.Name):
             stripped = stripped.parent
 
-        return (stripped.isinstance(er.Function, er.Class)
-                or stripped.isinstance(compiled.CompiledObject)
-                and stripped.type() in ('function', 'class'))
+        return stripped.is_callable()
 
     @property
+    @cache.underscore_memoization
     def params(self):
         """
         Raises an ``AttributeError``if the definition is not callable.