Use general (Provider|Service)Client structs.
diff --git a/openstack/identity/v3/services/requests_test.go b/openstack/identity/v3/services/requests_test.go
index d2637c4..6592fc6 100644
--- a/openstack/identity/v3/services/requests_test.go
+++ b/openstack/identity/v3/services/requests_test.go
@@ -31,7 +31,7 @@
 	})
 
 	client := gophercloud.ServiceClient{
-		ProviderClient: gophercloud.ProviderClient{
+		Provider: &gophercloud.ProviderClient{
 			TokenID: "1111",
 		},
 		Endpoint: testhelper.Endpoint(),