diff --git a/builtin/providers/aws/resource_aws_redshift_cluster_test.go b/builtin/providers/aws/resource_aws_redshift_cluster_test.go
index 93bf29c54..400b031b3 100644
--- a/builtin/providers/aws/resource_aws_redshift_cluster_test.go
+++ b/builtin/providers/aws/resource_aws_redshift_cluster_test.go
@@ -281,7 +281,7 @@ resource "aws_redshift_cluster" "default" {
   cluster_identifier = "tf-redshift-cluster-%d"
   availability_zone = "us-west-2a"
   database_name = "mydb"
-  master_username = "foo"
+  master_username = "foo_test"
   master_password = "Mustbe8characters"
   node_type = "dc1.large"
   automated_snapshot_retention_period = 7