diff --git a/src/@ionic-native/plugins/firebase-x/index.ts b/src/@ionic-native/plugins/firebase-x/index.ts
index 6ae7c89f7b..85d30d190c 100644
--- a/src/@ionic-native/plugins/firebase-x/index.ts
+++ b/src/@ionic-native/plugins/firebase-x/index.ts
@@ -119,6 +119,15 @@ export class FirebaseX extends IonicNativePlugin {
     return;
   }
 
+  /**
+   * Get the app instance ID (an constant ID which persists as long as the app is not uninstalled/reinstalled)
+   * @return {Promise<null | string>} Note that ID will be null if it has not been established yet
+   */
+  @Cordova()
+  getId(): Promise<null | string> {
+    return;
+  }
+
   /**
    * Get notified when a token is refreshed.
    * @return {Observable<any>}