diff --git a/CDT-subscription.xsd b/CDT-subscription.xsd
index 1691807560ce229f3eaca806871f7d8d6a51c014..c2ef753d408e45713dae0fefca1413835f957796 100644
--- a/CDT-subscription.xsd
+++ b/CDT-subscription.xsd
@@ -81,8 +81,8 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 	
 	<xs:complexType name="rateLimit">
 		<xs:sequence>
-			<xs:element name="maxNrOfNotify" type="xs:nonNegativeInteger" minOccurs="0" />
-			<xs:element name="timeWindow" type="xs:duration" minOccurs="0" />
+			<xs:element name="maxNrOfNotify" type="xs:nonNegativeInteger" />
+			<xs:element name="timeWindow" type="xs:duration" />
 		</xs:sequence>
 	</xs:complexType>