diff --git a/inc/post_code.hpp b/inc/post_code.hpp
index 498a0d8..be800f2 100644
--- a/inc/post_code.hpp
+++ b/inc/post_code.hpp
@@ -72,7 +72,7 @@
 {
     void operator()(sd_event *event) const
     {
-        event = sd_event_unref(event);
+        sd_event_unref(event);
     }
 };
 using EventPtr = std::unique_ptr<sd_event, EventDeleter>;