diff --git a/configs/lab-local/goa-regio-ng-koopa.yml b/configs/lab-local/goa-regio-ng-koopa.yml
index 00450d8..04d502e 100644
--- a/configs/lab-local/goa-regio-ng-koopa.yml
+++ b/configs/lab-local/goa-regio-ng-koopa.yml
@@ -53,7 +53,8 @@ regional_currency:
       regional_currency_common_amounts: "GOA:10 GOA:20 GOA:50 GOA:100 GOA:200 GOA:1000"
       regional_currency_static_coins_file: goa-exchange-coins.conf
       regional_currency_coin_withdraw_duration: 7 days
-      regional_currency_default_debt_limit: "GOA:4503599627370496"
+      # Must stay < 2^52 (libeufin amount overflow on withdraw confirm).
+      regional_currency_default_debt_limit: "GOA:1000000000000"
 
       regional_currency_exchange_master_public_key_expected: "TW6K5FXF81VYCAH0YWYX0SX98KBBSJ42VX27WAX01FTFH400QG10"
       regional_currency_exchange_master_priv_src: "{{ lookup('ansible.builtin.env', 'HOME') }}/git/admin-logs/koopa-admin-secrets/backups/goa/current/exchange-offline/master.priv"