diff --git a/default_profile.h b/default_profile.h
index 87e03fa..36374ae 100644
--- a/default_profile.h
+++ b/default_profile.h
@@ -29,6 +29,8 @@
   virtual ~DefaultProfile();
 
  private:
+  static const char kDefaultId[];
+
   DISALLOW_COPY_AND_ASSIGN(DefaultProfile);
 };