1 files changed, 1 insertions, 1 deletions
diff --git a/include/datetime/wakeup-timer-mainloop.h b/include/datetime/wakeup-timer-mainloop.h
index 480d728..86da8cf 100644
--- a/include/datetime/wakeup-timer-mainloop.h
+++ b/include/datetime/wakeup-timer-mainloop.h
@@ -39,7 +39,7 @@ namespace datetime {
 class MainloopWakeupTimer: public WakeupTimer
 {
 public:
-    MainloopWakeupTimer(const std::shared_ptr<Clock>&);
+    explicit MainloopWakeupTimer(const std::shared_ptr<Clock>&);
     ~MainloopWakeupTimer();
     void set_wakeup_time (const DateTime&);
     core::Signal<>& timeout();