diff --git a/miller/settings.py b/miller/settings.py
index bd3aadf..f108be9 100644
--- a/miller/settings.py
+++ b/miller/settings.py
@@ -192,7 +192,8 @@
 MILLER_DATA_SEPARATOR = "__"
 # Additional type choices for Document Model: must be a tuple
 MILLER_DOCUMENT_TYPE_CHOICES = tuple(
-    get_env_variable("MILLER_DOCUMENT_TYPE_CHOICES", "").split(",")
+    (x, x)
+    for x in get_env_variable("MILLER_DOCUMENT_TYPE_CHOICES", "gallery").split(",")
 )
 # Additional category choices for Tag Model: must be a tuple
 MILLER_TAG_CATEGORY_CHOICES = tuple()