diff --git a/trytond/trytond/_safe_genshi.py b/trytond/trytond/_safe_genshi.py
index ece068fbf0..8db061e32b 100644
--- a/trytond/trytond/_safe_genshi.py
+++ b/trytond/trytond/_safe_genshi.py
@@ -77,7 +77,7 @@ ALLOWED_BUILTINS = {
     'repr',
     'reversed',
     'round',
-    'set'
+    'set',
     'slice',
     'sorted',
     'str',