diff --git a/neutron/plugins/nicira/vshield/common/exceptions.py b/neutron/plugins/nicira/vshield/common/exceptions.py
index 346359af19..71f7cc5eff 100644
--- a/neutron/plugins/nicira/vshield/common/exceptions.py
+++ b/neutron/plugins/nicira/vshield/common/exceptions.py
@@ -69,4 +69,4 @@ class MediaTypeUnsupport(VcnsApiException):
 
 
 class ServiceUnavailable(VcnsApiException):
-    message = _("Service on available: %(uri)s")
+    message = _("Service Unavailable: %(uri)s")