diff --git a/mondumas/models/dossier.py b/mondumas/models/dossier.py
index 15795ff..db2d738 100644
--- a/mondumas/models/dossier.py
+++ b/mondumas/models/dossier.py
@@ -12,6 +12,7 @@ from zope.sqlalchemy import (
 
 from datetime import *
 import transaction
+import os
 
 def execute_query(request, query, params):
     """Execute query and mark session as changed"""