diff --git a/src/event/SocketEvent.cxx b/src/event/SocketEvent.cxx
index a4e04f072..d4cf04bfd 100644
--- a/src/event/SocketEvent.cxx
+++ b/src/event/SocketEvent.cxx
@@ -53,7 +53,8 @@ SocketEvent::Close() noexcept
 	if (!fd.IsDefined())
 		return;
 
-	loop.AbandonFD(fd.Get());
+	if (std::exchange(scheduled_flags, 0) != 0)
+		loop.AbandonFD(fd.Get());
 	fd.Close();
 }