diff --git a/SwitchEngines/README.md b/SwitchEngines/README.md
index 89aa1bc44a8141bfc119b4e087d6ff5d787b9faf..0261ec35735156f2500e09c542b58ddf0e300cec 100644
--- a/SwitchEngines/README.md
+++ b/SwitchEngines/README.md
@@ -518,7 +518,7 @@ lcl$ terraform output instance_id
 :question: What if the `my_instance_name` tag is changed outside TF? Try f.i.:
 ``` shell
 lcl$ openstack --os-cloud=engines server set \
-       --property my_instance_name="Foo-Bar" $(terraform output instance_id)
+       --property my_instance_name="Foo-Bar" $(terraform output -raw instance_id)
 ```
 
 :question: What must be done to have TF respect that external change?