diff --git a/src/common/TestUtils.test.ts b/src/common/TestUtils.test.ts
index 39e13fba..fbf3ebcd 100644
--- a/src/common/TestUtils.test.ts
+++ b/src/common/TestUtils.test.ts
@@ -54,6 +54,7 @@ export class MockBufferService implements IBufferService {
 }
 
 export class MockCoreMouseService implements ICoreMouseService {
+  public serviceBrand: any;
   public areMouseEventsActive: boolean = false;
   public activeEncoding: string = '';
   public activeProtocol: string = '';
diff --git a/src/common/services/CoreMouseService.ts b/src/common/services/CoreMouseService.ts
index fd880a5d..052353bc 100644
--- a/src/common/services/CoreMouseService.ts
+++ b/src/common/services/CoreMouseService.ts
@@ -167,6 +167,8 @@ const DEFAULT_ENCODINGS: { [key: string]: CoreMouseEncoding } = {
  * To send a mouse event call `triggerMouseEvent`.
  */
 export class CoreMouseService extends Disposable implements ICoreMouseService {
+  public serviceBrand: any;
+
   private _protocols: { [name: string]: ICoreMouseProtocol } = {};
   private _encodings: { [name: string]: CoreMouseEncoding } = {};
   private _activeProtocol: string = '';
diff --git a/src/common/services/Services.ts b/src/common/services/Services.ts
index 39da2680..4b3c4e3f 100644
--- a/src/common/services/Services.ts
+++ b/src/common/services/Services.ts
@@ -28,6 +28,8 @@ export interface IBufferService {
 
 export const ICoreMouseService = createDecorator<ICoreMouseService>('CoreMouseService');
 export interface ICoreMouseService {
+  serviceBrand: undefined;
+
   activeProtocol: string;
   activeEncoding: string;
   areMouseEventsActive: boolean;