diff --git a/src/github.com/matrix-org/dendrite/appservice/types/types.go b/src/github.com/matrix-org/dendrite/appservice/types/types.go
index ac83b264..c0fa56b0 100644
--- a/src/github.com/matrix-org/dendrite/appservice/types/types.go
+++ b/src/github.com/matrix-org/dendrite/appservice/types/types.go
@@ -1,5 +1,3 @@
-// Copyright 2018 New Vector Ltd
-//
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -31,3 +29,8 @@ type ApplicationServiceWorkerState struct {
 	// Backoff exponent (2^x secs). Max 6, aka 64s.
 	Backoff int
 }
+
+const (
+	// AppServiceDeviceID is the AS dummy device ID
+	AppServiceDeviceID = "AS_Device"
+)