diff --git a/google/service_scope.go b/google/service_scope.go
index 4b0a69c4b..e911ed3b1 100644
--- a/google/service_scope.go
+++ b/google/service_scope.go
@@ -26,6 +26,7 @@ func canonicalizeServiceScope(scope string) string {
 		"storage-ro":            "https://www.googleapis.com/auth/devstorage.read_only",
 		"storage-rw":            "https://www.googleapis.com/auth/devstorage.read_write",
 		"taskqueue":             "https://www.googleapis.com/auth/taskqueue",
+		"trace":                 "https://www.googleapis.com/auth/trace.append",
 		"trace-append":          "https://www.googleapis.com/auth/trace.append",
 		"trace-ro":              "https://www.googleapis.com/auth/trace.readonly",
 		"useraccounts-ro":       "https://www.googleapis.com/auth/cloud.useraccounts.readonly",