diff --git a/jedi/evaluate.py b/jedi/evaluate.py
index a82d26ac..3bf5f926 100644
--- a/jedi/evaluate.py
+++ b/jedi/evaluate.py
@@ -634,7 +634,7 @@ def follow_call_list(call_list, follow_array=False):
 def follow_call(call):
     """Follow a call is following a function, variable, string, etc."""
     path = call.generate_call_path()
-    scope = call.get_parent_until((pr.Scope, er.Execution))
+    scope = call.get_parent_until(pr.IsScope)
     return follow_call_path(path, scope, call.start_pos)
 
 
diff --git a/jedi/evaluate_representation.py b/jedi/evaluate_representation.py
index 7847395d..f38114c5 100644
--- a/jedi/evaluate_representation.py
+++ b/jedi/evaluate_representation.py
@@ -34,7 +34,7 @@ class DecoratorNotFound(LookupError):
     pass
 
 
-class Executable(pr.Base):
+class Executable(pr.IsScope):
     """
     An instance is also an executable - because __init__ is called
     :param var_args: The param input array, consist of `pr.Array` or list.
@@ -241,7 +241,7 @@ class InstanceElement(use_metaclass(cache.CachedMetaClass)):
         return "<%s of %s>" % (type(self).__name__, self.var)
 
 
-class Class(use_metaclass(cache.CachedMetaClass, pr.Base)):
+class Class(use_metaclass(cache.CachedMetaClass, pr.IsScope)):
     """
     This class is not only important to extend `pr.Class`, it is also a
     important for descriptors (if the descriptor methods are evaluated or not).
@@ -307,7 +307,7 @@ class Class(use_metaclass(cache.CachedMetaClass, pr.Base)):
         return "<e%s of %s>" % (type(self).__name__, self.base)
 
 
-class Function(use_metaclass(cache.CachedMetaClass, pr.Base)):
+class Function(use_metaclass(cache.CachedMetaClass, pr.IsScope)):
     """
     Needed because of decorators. Decorators are evaluated here.
     """
diff --git a/jedi/parsing_representation.py b/jedi/parsing_representation.py
index 016690cf..23396671 100644
--- a/jedi/parsing_representation.py
+++ b/jedi/parsing_representation.py
@@ -97,7 +97,11 @@ class Simple(Base):
                 (type(self).__name__, code, self.start_pos[0])
 
 
-class Scope(Simple):
+class IsScope(Base):
+    pass
+
+
+class Scope(Simple, IsScope):
     """
     Super class for the parser tree, which represents the state of a python
     text file.