diff --git a/source/src/main/java/ch/threema/apitool/messages/DeliveryReceipt.java b/source/src/main/java/ch/threema/apitool/messages/DeliveryReceipt.java
index 6f79f76..55d138e 100644
--- a/source/src/main/java/ch/threema/apitool/messages/DeliveryReceipt.java
+++ b/source/src/main/java/ch/threema/apitool/messages/DeliveryReceipt.java
@@ -84,7 +84,7 @@ public String toString() {
 	 * </ul>
 	 */
 	public enum Type {
-		RECEIVED(1), READ(2), USER_ACK(3);
+		RECEIVED(1), READ(2), USER_ACK(3), USER_DEC(4);
 
 		private final int code;