diff --git a/src/app/ng-intercom/intercom.module.ts b/src/app/ng-intercom/intercom.module.ts
index 1f7274c..83e538c 100644
--- a/src/app/ng-intercom/intercom.module.ts
+++ b/src/app/ng-intercom/intercom.module.ts
@@ -36,7 +36,7 @@ import { IntercomConfig } from './shared/intercom-config'
   ]
 })
 export class IntercomModule {
-  static forRoot(config: IntercomConfig): ModuleWithProviders {
+  static forRoot(config: IntercomConfig): ModuleWithProviders<IntercomModule> {
     return {
       ngModule: IntercomModule,
       providers: [