diff --git a/jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/JaxRsResourceBase.java b/jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/JaxRsResourceBase.java
index d9de231..3958b72 100644
--- a/jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/JaxRsResourceBase.java
+++ b/jaxrs/src/main/java/org/killbill/billing/jaxrs/resources/JaxRsResourceBase.java
@@ -344,7 +344,7 @@ public abstract class JaxRsResourceBase implements JaxrsResource {
case 1:
return pendingTransaction.iterator().next();
default:
- throw new PaymentApiException(ErrorCode.PAYMENT_INTERNAL_ERROR, String.format("Illegal payment state: Found multiple PENDING payment transactions for paymentId=%s", initialPayment.getId()));
+ throw new PaymentApiException(ErrorCode.PAYMENT_INTERNAL_ERROR, String.format("Illegal payment state: Found multiple PENDING payment transactions for paymentId='%s'", initialPayment.getId()));
}
}