diff --git a/mmc/activation_mmc.hpp b/mmc/activation_mmc.hpp
index 68caf36..aca8811 100644
--- a/mmc/activation_mmc.hpp
+++ b/mmc/activation_mmc.hpp
@@ -22,7 +22,7 @@
     Activations activation(Activations value) override;
 
   private:
-    void unitStateChange(sdbusplus::message::message& msg) override;
+    void unitStateChange(sdbusplus::message_t& msg) override;
     void startActivation() override;
     void finishActivation() override;
 };