diff --git a/lib/ansible/modules/cloud/cloudstack/cs_router.py b/lib/ansible/modules/cloud/cloudstack/cs_router.py
index f35fc955ac7..7437955d64a 100644
--- a/lib/ansible/modules/cloud/cloudstack/cs_router.py
+++ b/lib/ansible/modules/cloud/cloudstack/cs_router.py
@@ -317,7 +317,7 @@ class AnsibleCloudStackRouter(AnsibleCloudStack):
                 router = self.cs.changeServiceForRouter(**args)
 
                 if 'errortext' in router:
-                    self.module.fail_json(msg="Failed: '%s'" % res['errortext'])
+                    self.module.fail_json(msg="Failed: '%s'" % router['errortext'])
 
                 if state in [ 'restarted', 'started' ]:
                     router = self.start_router()