diff --git a/CDT-crossResourceSubscription.xsd b/CDT-crossResourceSubscription.xsd
index 88e426ad1a6b2f59dd7cb4e5e0d6ac82b387e7ab..a304d14b48b22cf1ed970de208184a1c15f9eff9 100644
--- a/CDT-crossResourceSubscription.xsd
+++ b/CDT-crossResourceSubscription.xsd
@@ -44,7 +44,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 						<xs:element name="regularResourcesAsTarget" type="m2m:listOfURIs" minOccurs="0" />
 						<xs:element name="subscriptionResourcesAsTarget" type="m2m:listOfURIs" minOccurs="0" />
 						<xs:element name="timeWindowType" type="m2m:timeWindowType" />
-						<xs:element name="timeWindowSize" type="m2m:absRelTimestamp" />
+						<xs:element name="timeWindowSize" type="xs:duration" />
 						<xs:element name="eventNotificationCriteriaSet" type="m2m:eventNotificationCriteriaSet" minOccurs="0" />
 						<xs:element name="notificationEventCat" type="m2m:eventCat" minOccurs="0" />
 						<xs:element name="expirationCounter" type="xs:positiveInteger" minOccurs="0" />