diff --git a/ksi-service-client/src/main/java/com/guardtime/ksi/pdu/v2/ExtensionResponsePduV2.java b/ksi-service-client/src/main/java/com/guardtime/ksi/pdu/v2/ExtensionResponsePduV2.java
index <HASH>..<HASH> 100644
--- a/ksi-service-client/src/main/java/com/guardtime/ksi/pdu/v2/ExtensionResponsePduV2.java
+++ b/ksi-service-client/src/main/java/com/guardtime/ksi/pdu/v2/ExtensionResponsePduV2.java
@@ -25,7 +25,7 @@ import com.guardtime.ksi.tlv.TLVElement;
 
 class ExtensionResponsePduV2 extends PduV2 {
 
-    private static final int[] SUPPORTED_PAYLOAD_TYPES = new int[]{0x02, 0x03};
+    private static final int[] SUPPORTED_PAYLOAD_TYPES = new int[]{0x02, 0x03, 0x4};
 
     public ExtensionResponsePduV2(TLVElement rootElement, KSIRequestContext context) throws KSIException {
         super(rootElement, context.getLoginKey());
Added child element tag 0x4 support to extender response pdu v2.