diff --git a/103221-1/TS_103_221_01_DestinationSet.xsd b/103221-1/TS_103_221_01_DestinationSet.xsd
index 698f66f8e2f1353454742028052479cae40963c5..ad7879e6959ee0f87187e13275d0e8752fd66da8 100644
--- a/103221-1/TS_103_221_01_DestinationSet.xsd
+++ b/103221-1/TS_103_221_01_DestinationSet.xsd
@@ -23,7 +23,7 @@
     <xs:complexType name="AssociatedDID">
         <xs:sequence>
             <xs:element name="dId" type="x1:DId"/>
-            <xs:element name="preference" type="xs:integer"/>
+            <xs:element name="preference" type="xs:integer" minOccurs="0"/>
         </xs:sequence>
     </xs:complexType>
     <xs:complexType name="DestinationSetDetailsExtension">