diff --git a/src/test/java/org/qortal/test/SerializationTests.java b/src/test/java/org/qortal/test/SerializationTests.java
index 5a9fffa8..d9fe978c 100644
--- a/src/test/java/org/qortal/test/SerializationTests.java
+++ b/src/test/java/org/qortal/test/SerializationTests.java
@@ -47,7 +47,6 @@ public class SerializationTests extends Common {
 				switch (txType) {
 					case GENESIS:
 					case ACCOUNT_FLAGS:
-					case AT:
 					case CHAT:
 					case PUBLICIZE:
 					case AIRDROP:
diff --git a/src/test/java/org/qortal/test/common/transaction/AtTestTransaction.java b/src/test/java/org/qortal/test/common/transaction/AtTestTransaction.java
index 74216f2f..38c1c7f3 100644
--- a/src/test/java/org/qortal/test/common/transaction/AtTestTransaction.java
+++ b/src/test/java/org/qortal/test/common/transaction/AtTestTransaction.java
@@ -18,10 +18,9 @@ public class AtTestTransaction extends TestTransaction {
 		String recipient = account.getAddress();
 		long amount = 123L * Amounts.MULTIPLIER;
 		final long assetId = Asset.QORT;
-		byte[] message = new byte[32];
-		random.nextBytes(message);
 
-		return new ATTransactionData(generateBase(account), atAddress, recipient, amount, assetId, message);
+		// Use PAYMENT-type - i.e. a null message
+		return new ATTransactionData(generateBase(account), atAddress, recipient, amount, assetId, null);
 	}
 
 }