diff --git a/caravel/forms.py b/caravel/forms.py
index 697fc976c..3372c269a 100644
--- a/caravel/forms.py
+++ b/caravel/forms.py
@@ -227,7 +227,7 @@ class FormFactory(object):
                 'Y',
                 choices=self.choicify(datasource.column_names),
                 description="Columns to display"),
-            'druid_time_origin': SelectField(
+            'druid_time_origin': FreeFormSelectField(
                 'Origin',
                 choices=(
                     ('', 'default'),