diff --git a/tests/basic_deployment.py b/tests/basic_deployment.py
index 7d625592..884e2400 100644
--- a/tests/basic_deployment.py
+++ b/tests/basic_deployment.py
@@ -324,7 +324,7 @@ class NeutronGatewayBasicDeployment(OpenStackAmuletDeployment):
             expected['service_username'] = 'nova'
         else:
             # Juno or earlier
-            expected['service_username'] = 's3_ec2_nova'
+            expected['service_username'] = 'ec2_nova_s3'
 
         ret = u.validate_relation_data(unit, relation, expected)
         if ret: