diff --git a/src/item_updater.hpp b/src/item_updater.hpp
index 2bfd39c..bc8930e 100644
--- a/src/item_updater.hpp
+++ b/src/item_updater.hpp
@@ -181,7 +181,7 @@
     void syncToLatestImage();
 
     /** @brief Invoke the activation via DBus */
-    void invokeActivation(const std::unique_ptr<Activation>& activation);
+    static void invokeActivation(const std::unique_ptr<Activation>& activation);
 
     /** @brief Callback function for interfaces added signal.
      *