diff --git a/v2_1_0/SEC-symmKeyReg-v2_1_0.xsd b/v2_1_0/SEC-symmKeyReg-v2_1_0.xsd
index 2bc100ec81d621242a843df4cf9a68b49a9cb188..3d2c9fe64410b7b678fab08919c1ba75f113a63d 100644
--- a/v2_1_0/SEC-symmKeyReg-v2_1_0.xsd
+++ b/v2_1_0/SEC-symmKeyReg-v2_1_0.xsd
@@ -46,7 +46,7 @@ oneM2M EXPRESSLY ADVISES ANY AND ALL USE OF OR RELIANCE UPON THIS INFORMATION PR
 					    <xs:element name="adminFQDN" type="xs:anyURI" minOccurs="1" />
 					    <xs:element name="SUID" type="m2m:suid" minOccurs="1" />
 						<xs:element name="targetIDs" type="m2m:listOfM2MID" minOccurs="1" />
-						<xs:element name="keyValue" type="xs:base64Binary" minOccurs="1" />
+						<xs:element name="keyValue" type="xs:hexBinary" minOccurs="1" />
 				
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