diff --git a/packages/taler-util/src/wallet-types.ts b/packages/taler-util/src/wallet-types.ts
index 233c95047..2e26b79ef 100644
--- a/packages/taler-util/src/wallet-types.ts
+++ b/packages/taler-util/src/wallet-types.ts
@@ -2427,8 +2427,8 @@ export interface AcceptPeerPullPaymentResponse {
 export const codecForConfirmPeerPushPaymentRequest =
   (): Codec<ConfirmPeerPushCreditRequest> =>
     buildCodecForObject<ConfirmPeerPushCreditRequest>()
-      .property("peerPushPaymentIncomingId", codecForString())
-      .property("transactionId", codecForString())
+      .property("peerPushPaymentIncomingId", codecOptional(codecForString()))
+      .property("transactionId", codecOptional(codecForString()))
       .build("ConfirmPeerPushCreditRequest");
 
 export interface ConfirmPeerPullDebitRequest {