diff --git a/camera/device/default/ExternalCameraOfflineSession.h b/camera/device/default/ExternalCameraOfflineSession.h
index 5795c95..1d0c057 100644
--- a/camera/device/default/ExternalCameraOfflineSession.h
+++ b/camera/device/default/ExternalCameraOfflineSession.h
@@ -39,9 +39,9 @@
 using ::aidl::android::hardware::common::fmq::MQDescriptor;
 using ::aidl::android::hardware::common::fmq::SynchronizedReadWrite;
 
-class ExternalCameraOfflineSession : public BnCameraOfflineSession,
-                                     public virtual RefBase,
-                                     public virtual OutputThreadInterface {
+class ExternalCameraOfflineSession final : public BnCameraOfflineSession,
+                                           public virtual RefBase,
+                                           public virtual OutputThreadInterface {
   public:
     ExternalCameraOfflineSession(const CroppingType& croppingType,
                                  const common::V1_0::helper::CameraMetadata& chars,