diff --git a/VoldNativeService.h b/VoldNativeService.h
index 123f127..33d0f3a 100644
--- a/VoldNativeService.h
+++ b/VoldNativeService.h
@@ -127,6 +127,7 @@
                                     const std::string& secret);
     binder::Status fixateNewestUserKeyAuth(int32_t userId);
 
+    binder::Status getUnlockedUsers(std::vector<int>* _aidl_return);
     binder::Status unlockUserKey(int32_t userId, int32_t userSerial, const std::string& token,
                                  const std::string& secret);
     binder::Status lockUserKey(int32_t userId);