diff --git a/src/mint/taler-mint-httpd_db.c b/src/mint/taler-mint-httpd_db.c
index 12e4f3e78..4ae4408e5 100644
--- a/src/mint/taler-mint-httpd_db.c
+++ b/src/mint/taler-mint-httpd_db.c
@@ -501,8 +501,6 @@ refresh_accept_melts (struct MHD_Connection *connection,
  * required value left and if so, store that they have been
  * melted and confirm the melting operation to the client.
  *
- * FIXME: some arguments are redundant here...
- *
  * @param connection the MHD connection to handle
  * @param melt_hash hash code of the session the coins are melted into
  * @param refresh_session_pub public key of the refresh session
diff --git a/src/mint/taler-mint-httpd_refresh.c b/src/mint/taler-mint-httpd_refresh.c
index d36e42085..a5d609ed8 100644
--- a/src/mint/taler-mint-httpd_refresh.c
+++ b/src/mint/taler-mint-httpd_refresh.c
@@ -162,12 +162,10 @@ handle_refresh_melt_binary (struct MHD_Connection *connection,
                                        "{s:s}",
                                        "error", "value mismatch");
   }
-
-  /* FIXME: we must also store the signature over the melt! (#3635) */
   return TALER_MINT_db_execute_refresh_melt (connection,
                                              &melt_hash,
                                              refresh_session_pub,
-                                             NULL, /* FIXME: #3635! */
+                                             commit_client_sig,
                                              num_new_denoms,
                                              denom_pubs,
                                              coin_count,