diff --git a/product/ERP5Type/patches/Restricted.py b/product/ERP5Type/patches/Restricted.py
index 76e32d2fb185eaf760fb62e9add550745f8ff8ad..b64b92ec69e0e551857169b3465fe69c2520ec05 100644
--- a/product/ERP5Type/patches/Restricted.py
+++ b/product/ERP5Type/patches/Restricted.py
@@ -178,3 +178,11 @@ allow_module('difflib')
 allow_module('hashlib')
 allow_module('time')
 allow_module('urlparse')
+
+ModuleSecurityInfo('os.path').declarePublic(
+# Allow functions accessing neither file system nor environment.
+  'abspath', 'basename', 'commonprefix', 'dirname', 'isabs', 'join',
+  'normpath', 'split', 'splitext',
+# Also allow some handy data properties.
+  'sep', 'pardir', 'curdir', 'extsep',
+)