diff --git a/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/OmemoRatchet.java b/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/OmemoRatchet.java
index 3d505798c..4a779f6c9 100644
--- a/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/OmemoRatchet.java
+++ b/smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/OmemoRatchet.java
@@ -184,7 +184,7 @@ public abstract class OmemoRatchet<T_IdKeyPair, T_IdKey, T_PreKey, T_SigPreKey,
 
         byte[] payload = new byte[element.getPayload().length + authTag.length];
         System.arraycopy(element.getPayload(), 0, payload, 0, element.getPayload().length);
-        System.arraycopy(authTag, 0, payload, payload.length, authTag.length);
+        System.arraycopy(authTag, 0, payload, element.getPayload().length, authTag.length);
         return payload;
     }