diff --git a/core/src/main/java/org/bitcoinj/wallet/Wallet.java b/core/src/main/java/org/bitcoinj/wallet/Wallet.java
index 88b1c6f21..da2dc6c33 100644
--- a/core/src/main/java/org/bitcoinj/wallet/Wallet.java
+++ b/core/src/main/java/org/bitcoinj/wallet/Wallet.java
@@ -5234,7 +5234,7 @@ public class Wallet extends BaseTaggableObject
         for (Transaction tx : toBroadcast) {
             ConfidenceType confidenceType = tx.getConfidence().getConfidenceType();
             checkState(confidenceType == ConfidenceType.PENDING || confidenceType == ConfidenceType.IN_CONFLICT,
-                    "Expected PENDING or IN_CONFLICT, was %s.", confidenceType);
+                    "Tx %s: expected PENDING or IN_CONFLICT, was %s", tx.getTxId(), confidenceType);
             // Re-broadcast even if it's marked as already seen for two reasons
             // 1) Old wallets may have transactions marked as broadcast by 1 peer when in reality the network
             //    never saw it, due to bugs.