diff --git a/flash.hpp b/flash.hpp
index c276017..0da94de 100644
--- a/flash.hpp
+++ b/flash.hpp
@@ -29,7 +29,7 @@
     /**
      * @brief Takes action when the state of the activation service file changes
      */
-    virtual void onStateChanges(sdbusplus::message::message& msg) = 0;
+    virtual void onStateChanges(sdbusplus::message_t& msg) = 0;
 };
 
 } // namespace updater