diff --git a/packages/taler-wallet-core/src/crypto/cryptoImplementation.ts b/packages/taler-wallet-core/src/crypto/cryptoImplementation.ts
index 316755840..52d2dd24e 100644
--- a/packages/taler-wallet-core/src/crypto/cryptoImplementation.ts
+++ b/packages/taler-wallet-core/src/crypto/cryptoImplementation.ts
@@ -803,7 +803,6 @@ export const nativeCryptoR: TalerCryptoInterfaceR = {
     const p = buildSigPS(TalerSignaturePurpose.MERCHANT_TRACK_TRANSACTION)
       .put(decodeCrock(req.contractTermsHash))
       .put(decodeCrock(req.wireHash))
-      .put(decodeCrock(req.merchantPub))
       .put(decodeCrock(req.coinPub))
       .build();
     return { sig: encodeCrock(eddsaSign(p, decodeCrock(req.merchantPriv))) };