diff --git a/include/TimedDoor.h b/include/TimedDoor.h
index 783383b..9fa2d86 100644
--- a/include/TimedDoor.h
+++ b/include/TimedDoor.h
@@ -1,7 +1,6 @@
 // Copyright 2024 Smirnov Leonid
 
-#ifndef INCLUDE_TIMEDDOOR_H_
-#define INCLUDE_TIMEDDOOR_H_
+#pragma once
 
 class DoorTimerAdapter;
 class Timer;
@@ -48,5 +47,3 @@ class Timer {
  public:
   void tregister(int, TimerClient*);
 };
-
-#endif  // INCLUDE_TIMEDDOOR_H_