diff --git a/openerp/addons/base/rng/view.rng b/openerp/addons/base/rng/view.rng
index 408d032d75c..5556d131fee 100644
--- a/openerp/addons/base/rng/view.rng
+++ b/openerp/addons/base/rng/view.rng
@@ -354,6 +354,7 @@
             <rng:optional><rng:attribute name="date_stop"/></rng:optional>
             <rng:optional><rng:attribute name="date_string"/></rng:optional>
             <rng:optional><rng:attribute name="string"/></rng:optional>
+            <rng:optional><rng:attribute name="default_group_by"/></rng:optional>
             <rng:zeroOrMore>
                 <rng:optional><rng:ref name="level"/></rng:optional>
                 <rng:optional><rng:ref name="field"/></rng:optional>