diff --git a/provider/joyent/provider.go b/provider/joyent/provider.go
index <HASH>..<HASH> 100644
--- a/provider/joyent/provider.go
+++ b/provider/joyent/provider.go
@@ -30,7 +30,7 @@ var _ simplestreams.HasRegion = (*joyentEnviron)(nil)
 
 // RestrictedConfigAttributes is specified in the EnvironProvider interface.
 func (joyentProvider) RestrictedConfigAttributes() []string {
-	return nil
+	return []string{sdcUrl}
 }
 
 // PrepareForCreateEnvironment is specified in the EnvironProvider interface.
lp<I>: Use controller region for hosted models

Hosted models in joyent were not using the same
region as the controller.  sdc-url should not be
overwritten / set to default for hosted models.