diff --git a/common/fake_prefs.h b/common/fake_prefs.h
index 7ae9fb9..721cf24 100644
--- a/common/fake_prefs.h
+++ b/common/fake_prefs.h
@@ -59,6 +59,9 @@
   void AddObserver(std::string_view key, ObserverInterface* observer) override;
   void RemoveObserver(std::string_view key,
                       ObserverInterface* observer) override;
+  bool StartTransaction() override { return false; }
+  bool CancelTransaction() override { return false; }
+  bool SubmitTransaction() override { return false; }
 
  private:
   enum class PrefType {