diff --git a/common/fake_hardware.h b/common/fake_hardware.h
index 30b5718..82382ff 100644
--- a/common/fake_hardware.h
+++ b/common/fake_hardware.h
@@ -202,7 +202,7 @@
     build_timestamp_ = build_timestamp;
   }
 
-  void SetWarmReset(bool warm_reset) { warm_reset_ = warm_reset; }
+  void SetWarmReset(bool warm_reset) override { warm_reset_ = warm_reset; }
 
   // Getters to verify state.
   int GetMaxKernelKeyRollforward() const { return kernel_max_rollforward_; }