diff --git a/bin/addons/base/rng/view.rng b/bin/addons/base/rng/view.rng
index 5496f8b16a2..6996a2fedb1 100644
--- a/bin/addons/base/rng/view.rng
+++ b/bin/addons/base/rng/view.rng
@@ -336,6 +336,7 @@
             <rng:optional><rng:attribute name="readonly"/></rng:optional>
             <rng:optional><rng:attribute name="position"/></rng:optional>
             <rng:optional><rng:attribute name="context"/></rng:optional>
+            <rng:optional><rng:attribute name="confirm"/></rng:optional>
             <rng:zeroOrMore>
                 <rng:choice>
                     <rng:ref name="form" />