diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 1a9ad571..2c535d98 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -111,7 +111,7 @@ class Evaluator(object):
     @property
     @evaluator_function_cache()
     def builtins_module(self):
-        return compiled.get_special_object(self, 'BUILTINS')
+        return compiled.get_special_object(self, u'BUILTINS')
 
     def reset_recursion_limitations(self):
         self.recursion_detector = recursion.RecursionDetector()
diff --git a/jedi/evaluate/context/function.py b/jedi/evaluate/context/function.py
index 8fb8389b..e06676de 100644
--- a/jedi/evaluate/context/function.py
+++ b/jedi/evaluate/context/function.py
@@ -83,9 +83,9 @@ class FunctionContext(use_metaclass(CachedMetaClass, TreeContext)):
         # This differentiation is only necessary for Python2. Python3 does not
         # use a different method class.
         if isinstance(parser_utils.get_parent_scope(self.tree_node), tree.Class):
-            name = 'METHOD_CLASS'
+            name = u'METHOD_CLASS'
         else:
-            name = 'FUNCTION_CLASS'
+            name = u'FUNCTION_CLASS'
         return compiled.get_special_object(self.evaluator, name)
 
     @property
diff --git a/jedi/evaluate/context/iterable.py b/jedi/evaluate/context/iterable.py
index 7585852b..0255234f 100644
--- a/jedi/evaluate/context/iterable.py
+++ b/jedi/evaluate/context/iterable.py
@@ -67,7 +67,7 @@ class GeneratorMixin(object):
         return ContextSet.from_sets(lazy_context.infer() for lazy_context in self.py__iter__())
 
     def get_filters(self, search_global, until_position=None, origin_scope=None):
-        gen_obj = compiled.get_special_object(self.evaluator, 'GENERATOR_OBJECT')
+        gen_obj = compiled.get_special_object(self.evaluator, u'GENERATOR_OBJECT')
         yield SpecialMethodFilter(self, self.builtin_methods, gen_obj)
         for filter in gen_obj.get_filters(search_global):
             yield filter
@@ -76,7 +76,7 @@ class GeneratorMixin(object):
         return True
 
     def py__class__(self):
-        gen_obj = compiled.get_special_object(self.evaluator, 'GENERATOR_OBJECT')
+        gen_obj = compiled.get_special_object(self.evaluator, u'GENERATOR_OBJECT')
         return gen_obj.py__class__()
 
     @property
diff --git a/jedi/evaluate/context/module.py b/jedi/evaluate/context/module.py
index 9833207a..8b88c4ff 100644
--- a/jedi/evaluate/context/module.py
+++ b/jedi/evaluate/context/module.py
@@ -204,7 +204,7 @@ class ModuleContext(use_metaclass(CachedMetaClass, TreeContext)):
         return names
 
     def py__class__(self):
-        return compiled.get_special_object(self.evaluator, 'MODULE_CLASS')
+        return compiled.get_special_object(self.evaluator, u'MODULE_CLASS')
 
     def __repr__(self):
         return "<%s: %s@%s-%s>" % (