diff --git a/src/event/Loop.cxx b/src/event/Loop.cxx
index eea7415d9..a73e1e963 100644
--- a/src/event/Loop.cxx
+++ b/src/event/Loop.cxx
@@ -224,18 +224,6 @@ EventLoop::RunOneIdle() noexcept
 	return true;
 }
 
-template<class ToDuration, class Rep, class Period>
-static constexpr ToDuration
-duration_cast_round_up(std::chrono::duration<Rep, Period> d) noexcept
-{
-	using FromDuration = decltype(d);
-	constexpr auto one = std::chrono::duration_cast<FromDuration>(ToDuration(1));
-	constexpr auto round_add = one > one.zero()
-		? one - FromDuration(1)
-		: one.zero();
-	return std::chrono::duration_cast<ToDuration>(d + round_add);
-}
-
 /**
  * Convert the given timeout specification to a milliseconds integer,
  * to be used by functions like poll() and epoll_wait().  Any negative
@@ -245,7 +233,7 @@ static constexpr int
 ExportTimeoutMS(Event::Duration timeout) noexcept
 {
 	return timeout >= timeout.zero()
-		? int(duration_cast_round_up<std::chrono::milliseconds>(timeout).count())
+		? static_cast<int>(std::chrono::ceil<std::chrono::milliseconds>(timeout).count())
 		: -1;
 }