diff --git a/src/mintdb/plugin_mintdb_postgres.c b/src/mintdb/plugin_mintdb_postgres.c
index 19ae3a3bd..6fc3b4410 100644
--- a/src/mintdb/plugin_mintdb_postgres.c
+++ b/src/mintdb/plugin_mintdb_postgres.c
@@ -1409,7 +1409,7 @@ postgres_insert_deposit (void *cls,
     TALER_PQ_QUERY_PARAM_PTR (&amount_nbo.value),
     TALER_PQ_QUERY_PARAM_PTR (&amount_nbo.fraction),
     TALER_PQ_QUERY_PARAM_PTR_SIZED (amount_nbo.currency,
-                                    TALER_CURRENCY_LEN - 1),
+                                    3),
     TALER_PQ_QUERY_PARAM_PTR (&deposit->merchant_pub),
     TALER_PQ_QUERY_PARAM_PTR (&deposit->h_contract),
     TALER_PQ_QUERY_PARAM_PTR (&deposit->h_wire),