diff --git a/scheduled_host_transition.hpp b/scheduled_host_transition.hpp
index 5582bf6..82e0731 100644
--- a/scheduled_host_transition.hpp
+++ b/scheduled_host_transition.hpp
@@ -107,7 +107,7 @@
     /** @brief The deleter of sd_event_source */
     std::function<void(sd_event_source*)> sdEventSourceDeleter =
         [](sd_event_source* p) {
-        if (p)
+        if (p != nullptr)
         {
             sd_event_source_unref(p);
         }