diff --git a/vending-app/src/main/aidl/com/google/android/play/core/integrity/protocol/IRequestDialogCallback.aidl b/vending-app/src/main/aidl/com/google/android/play/core/integrity/protocol/IRequestDialogCallback.aidl
index 857030193c..64b61c98d9 100644
--- a/vending-app/src/main/aidl/com/google/android/play/core/integrity/protocol/IRequestDialogCallback.aidl
+++ b/vending-app/src/main/aidl/com/google/android/play/core/integrity/protocol/IRequestDialogCallback.aidl
@@ -6,5 +6,5 @@
 package com.google.android.play.core.integrity.protocol;
 
 interface IRequestDialogCallback {
-    void onRequestDialog(in Bundle bundle);
+    void onRequestDialog(in Bundle bundle) = 1;
 }
\ No newline at end of file