diff --git a/src/mint-lib/mint_api_refresh.c b/src/mint-lib/mint_api_refresh.c
index 58fe11264..e5e9b291b 100644
--- a/src/mint-lib/mint_api_refresh.c
+++ b/src/mint-lib/mint_api_refresh.c
@@ -1357,7 +1357,7 @@ melted_coin_to_json (const struct GNUNET_HashCode *melt_session_hash,
                                           sizeof (melt.coin_pub)),
                     "denom_pub",
                     TALER_json_from_rsa_public_key (mc->pub_key.rsa_public_key),
-                    "denom_sig", 42,
+                    "denom_sig",
                     TALER_json_from_rsa_signature (mc->sig.rsa_signature),
                     "confirm_sig",
                     TALER_json_from_data (&confirm_sig,