diff --git a/src/event.hpp b/src/event.hpp
index 8006c23..22834bf 100644
--- a/src/event.hpp
+++ b/src/event.hpp
@@ -30,7 +30,7 @@
             IndexedCallback(index) {}
 
         /** @brief Callback interface implementation. */
-        void operator()() override
+        void operator()(Context ctx) override
         {
             for (const auto& n : index)
             {