diff --git a/google/service_scope.go b/google/service_scope.go
index 8ff1633b10a..f3ba4c06b55 100644
--- a/google/service_scope.go
+++ b/google/service_scope.go
@@ -15,6 +15,7 @@ func canonicalizeServiceScope(scope string) string {
 		"datastore":             "https://www.googleapis.com/auth/datastore",
 		"logging-write":         "https://www.googleapis.com/auth/logging.write",
 		"monitoring":            "https://www.googleapis.com/auth/monitoring",
+		"monitoring-read":       "https://www.googleapis.com/auth/monitoring.read",
 		"monitoring-write":      "https://www.googleapis.com/auth/monitoring.write",
 		"pubsub":                "https://www.googleapis.com/auth/pubsub",
 		"service-control":       "https://www.googleapis.com/auth/servicecontrol",