diff --git a/hardware.h b/hardware.h
index cbf8aee..7f895c9 100644
--- a/hardware.h
+++ b/hardware.h
@@ -18,6 +18,9 @@
 
   // HardwareInterface methods.
   virtual const std::string BootDevice();
+  virtual std::string GetHardwareClass();
+  virtual std::string GetFirmwareVersion();
+  virtual std::string GetECVersion();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Hardware);