diff --git a/clock.h b/clock.h
index 027bcff..8cfe366 100644
--- a/clock.h
+++ b/clock.h
@@ -18,6 +18,8 @@
 
   virtual base::Time GetMonotonicTime();
 
+  virtual base::Time GetBootTime();
+
  private:
 
   DISALLOW_COPY_AND_ASSIGN(Clock);