diff --git a/doctrine-mapping.xsd b/doctrine-mapping.xsd
index f7364b7f7..fea44a691 100644
--- a/doctrine-mapping.xsd
+++ b/doctrine-mapping.xsd
@@ -429,7 +429,6 @@
     <xs:attribute name="unique" type="xs:boolean" default="false" />
     <xs:attribute name="nullable" type="xs:boolean" default="true" />
     <xs:attribute name="on-delete" type="orm:fk-action" />
-    <xs:attribute name="on-update" type="orm:fk-action" />
     <xs:attribute name="column-definition" type="xs:string" />
     <xs:anyAttribute namespace="##other"/>
   </xs:complexType>