diff --git a/mayan/apps/documents/models/document_models.py b/mayan/apps/documents/models/document_models.py
index 2cf2bd5aa2..5512a720ce 100644
--- a/mayan/apps/documents/models/document_models.py
+++ b/mayan/apps/documents/models/document_models.py
@@ -22,7 +22,7 @@ from ..signals import post_document_type_change
 
 from .document_type_models import DocumentType
 
-__all__ = ('Document',)
+__all__ = ('Document', 'UUID_FUNCTION')
 logger = logging.getLogger(__name__)