diff --git a/daemon_state_android.h b/daemon_state_android.h
index 69180bc..fc8be19 100644
--- a/daemon_state_android.h
+++ b/daemon_state_android.h
@@ -43,7 +43,7 @@
   void AddObserver(ServiceObserverInterface* observer) override;
   void RemoveObserver(ServiceObserverInterface* observer) override;
 
-  const std::set<ServiceObserverInterface*>& service_observers() {
+  const std::set<ServiceObserverInterface*>& service_observers() override {
     return service_observers_;
   }