diff --git a/openerp/addons/base/rng/view.rng b/openerp/addons/base/rng/view.rng
index 794eade6b89..d996dfd971f 100644
--- a/openerp/addons/base/rng/view.rng
+++ b/openerp/addons/base/rng/view.rng
@@ -652,6 +652,7 @@
             <rng:optional><rng:attribute name="event_open_popup" /></rng:optional>            
             <rng:optional><rng:attribute name="attendee" /></rng:optional>
             <rng:optional><rng:attribute name="color_is_attendee" /></rng:optional>
+            <rng:optional><rng:attribute name="avatar_filter" /></rng:optional>
             <rng:optional><rng:attribute name="avatar_model" /></rng:optional>
             <rng:optional><rng:attribute name="avatar_title" /></rng:optional>
             <rng:optional><rng:attribute name="use_contacts" /></rng:optional>