diff --git a/ydb/core/util/hp_timer_helpers.h b/ydb/core/util/hp_timer_helpers.h
index e168b33ce869..9503515f9c41 100644
--- a/ydb/core/util/hp_timer_helpers.h
+++ b/ydb/core/util/hp_timer_helpers.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <util/system/hp_timer.h>
 #include <ydb/library/actors/util/datetime.h>
 
diff --git a/ydb/library/actors/util/datetime.h b/ydb/library/actors/util/datetime.h
index cbec5965d623..c3fdaeedf6d4 100644
--- a/ydb/library/actors/util/datetime.h
+++ b/ydb/library/actors/util/datetime.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <algorithm>
+
 #include <util/system/defaults.h>
 #include <util/system/hp_timer.h>
 #include <util/system/platform.h>