diff --git a/addons/document/nodes.py b/addons/document/nodes.py
index 0669ece73aa..c1a11459c0a 100644
--- a/addons/document/nodes.py
+++ b/addons/document/nodes.py
@@ -27,6 +27,7 @@ from osv.orm import except_orm
 import pooler
 from tools.safe_eval import safe_eval
 
+import errno
 import os
 import time