diff --git a/src/testing/test_bank_api_nexus.conf b/src/testing/test_bank_api_nexus.conf
index 4635b2105..a4aee53fc 100644
--- a/src/testing/test_bank_api_nexus.conf
+++ b/src/testing/test_bank_api_nexus.conf
@@ -8,7 +8,9 @@ PAYTO_URI = payto://iban/IBAN/UNUSED
 METHOD = x-taler-bank
 WIRE_GATEWAY_URL = http://localhost:5001/taler
 WIRE_GATEWAY_AUTH_METHOD = basic
-USERNAME = Exchange
+# the exchange authenticates as the 'admin' user,
+# since that makes the test preparation just easier.
+USERNAME = admin
 PASSWORD = x
 
 [bank]