diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index ff75b271..c94de681 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -136,7 +136,10 @@ class Script(object):
         if not dot:
             # add named params
             for call_sig in self.call_signatures():
-                if not isinstance(call_sig.module, compiled.CompiledObject):
+                # allow protected access, because it's a public API.
+                module = call_sig._executable.get_parent_until()
+                # Compiled modules typically don't allow keyword arguments.
+                if not isinstance(module, compiled.CompiledObject):
                     for p in call_sig.params:
                         # Allow access on _definition here, because it's a
                         # public API and we don't want to make the internal
diff --git a/jedi/api/classes.py b/jedi/api/classes.py
index 664beddc..eab09b54 100644
--- a/jedi/api/classes.py
+++ b/jedi/api/classes.py
@@ -586,10 +586,6 @@ class CallSignature(object):
         """ The name (e.g. 'isinstance') as a string. """
         return unicode(self._executable.name)
 
-    @property
-    def module(self):
-        return self._executable.get_parent_until()
-
     def __repr__(self):
         return '<%s: %s index %s>' % (type(self).__name__, self._executable,
                                       self.index)