diff --git a/clients/oxygen/oxygenbutton.h b/clients/oxygen/oxygenbutton.h
index e07a60dd04..9d90261c53 100644
--- a/clients/oxygen/oxygenbutton.h
+++ b/clients/oxygen/oxygenbutton.h
@@ -108,7 +108,7 @@ namespace Oxygen
     private:
 
     //! parent client
-    OxygenClient &client_;
+    const OxygenClient &client_;
 
     //! helper
     OxygenHelper &helper_;