diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISessionCallback.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISessionCallback.aidl
index 477ba5a..caf65ae 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISessionCallback.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISessionCallback.aidl
@@ -19,8 +19,8 @@
 @VintfStability
 interface ISessionCallback {
   void onStateChanged(in int cookie, in android.hardware.biometrics.face.SessionState state);
-  void onChallengeGenerated(in int sensorId, in int userId, in long challenge);
-  void onChallengeRevoked(in int sensorId, in int userId, in long challenge);
+  void onChallengeGenerated(in long challenge);
+  void onChallengeRevoked(in long challenge);
   void onAcquired(in android.hardware.biometrics.face.AcquiredInfo info, in int vendorCode);
   void onError(in android.hardware.biometrics.face.Error error, in int vendorCode);
   void onEnrollmentProgress(in int enrollmentId, int remaining);
diff --git a/biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl b/biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl
index 2608d5f..fd4a648 100644
--- a/biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl
+++ b/biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl
@@ -31,12 +31,12 @@
     /**
      * Notifies the framework when a challenge is successfully generated.
      */
-    void onChallengeGenerated(in int sensorId, in int userId, in long challenge);
+    void onChallengeGenerated(in long challenge);
 
     /**
      * Notifies the framework when a challenge has been revoked.
      */
-    void onChallengeRevoked(in int sensorId, in int userId, in long challenge);
+    void onChallengeRevoked(in long challenge);
 
     /**
      * This method must only be used to notify the framework during the following states:
diff --git a/biometrics/face/aidl/vts/VtsHalBiometricsFaceTargetTest.cpp b/biometrics/face/aidl/vts/VtsHalBiometricsFaceTargetTest.cpp
index c1ba66b..5f10306 100644
--- a/biometrics/face/aidl/vts/VtsHalBiometricsFaceTargetTest.cpp
+++ b/biometrics/face/aidl/vts/VtsHalBiometricsFaceTargetTest.cpp
@@ -51,13 +51,11 @@
         return ndk::ScopedAStatus::ok();
     }
 
-    ndk::ScopedAStatus onChallengeGenerated(int32_t /*sensorId*/, int32_t /*userId*/,
-                                            int64_t /*challenge*/) override {
+    ndk::ScopedAStatus onChallengeGenerated(int64_t /*challenge*/) override {
         return ndk::ScopedAStatus::ok();
     }
 
-    ndk::ScopedAStatus onChallengeRevoked(int32_t /*sensorId*/, int32_t /*userId*/,
-                                          int64_t /*challenge*/) override {
+    ndk::ScopedAStatus onChallengeRevoked(int64_t /*challenge*/) override {
         return ndk::ScopedAStatus::ok();
     }