diff --git a/daemon.h b/daemon.h
index 5aef8c5..66841f6 100644
--- a/daemon.h
+++ b/daemon.h
@@ -31,6 +31,7 @@
 class UpdateEngineDaemon : public brillo::DBusDaemon {
  public:
   UpdateEngineDaemon() = default;
+  ~UpdateEngineDaemon();
 
  protected:
   int OnInit() override;
@@ -46,9 +47,11 @@
   // the main() function.
   Subprocess subprocess_;
 
-  std::unique_ptr<RealSystemState> real_system_state_;
   std::unique_ptr<UpdateEngineAdaptor> dbus_adaptor_;
 
+  // The RealSystemState uses the previous classes so it should be defined last.
+  std::unique_ptr<RealSystemState> real_system_state_;
+
   DISALLOW_COPY_AND_ASSIGN(UpdateEngineDaemon);
 };