diff --git a/src/bank-lib/bank_api_admin.c b/src/bank-lib/bank_api_admin.c
index 515181a80..36872d7a9 100644
--- a/src/bank-lib/bank_api_admin.c
+++ b/src/bank-lib/bank_api_admin.c
@@ -176,7 +176,7 @@ TALER_BANK_admin_add_incoming (struct TALER_BANK_Context *bank,
   admin_obj = json_pack ("{s:o, s:o,"
                          " s:I, s:I}",
                          "wid", GNUNET_JSON_from_data (wtid,
-                                                       sizeof (*wtid)),
+                                                       sizeof (*wtid)), /* #4340 */
                          "amount", TALER_JSON_from_amount (amount),
                          "debit_account", (json_int_t) debit_account_no,
                          "credit_account", (json_int_t) credit_account_no);