diff --git a/tailbone/grids/filters.py b/tailbone/grids/filters.py
index e5618320..87523d32 100644
--- a/tailbone/grids/filters.py
+++ b/tailbone/grids/filters.py
@@ -29,6 +29,7 @@ from __future__ import unicode_literals, absolute_import
 import datetime
 import logging
 
+import six
 import sqlalchemy as sa
 
 from rattail.gpc import GPC
@@ -106,7 +107,7 @@ class EnumValueRenderer(ChoiceValueRenderer):
 
     def __init__(self, enum):
         sorted_keys = sorted(enum, key=lambda k: enum[k].lower())
-        self.options = [tags.Option(enum[k], k) for k in sorted_keys]
+        self.options = [tags.Option(enum[k], six.text_type(k)) for k in sorted_keys]
 
 
 class GridFilter(object):