diff --git a/src/frontend_common/config.h b/src/frontend_common/config.h
index 35c3273e2..1a0a1fe64 100644
--- a/src/frontend_common/config.h
+++ b/src/frontend_common/config.h
@@ -53,6 +53,9 @@ protected:
 
     void Reload();
 
+    void ReadMirrorValues();
+    void SaveMirrorValues();
+
     /**
      * Derived config classes must implement this so they can reload all platform-specific
      * values and global ones.