diff --git a/src/libutil/unix/monitor-fd.hh b/src/libutil/unix/monitor-fd.hh
index d59832452..c1f8705eb 100644
--- a/src/libutil/unix/monitor-fd.hh
+++ b/src/libutil/unix/monitor-fd.hh
@@ -122,7 +122,7 @@ public:
 
     ~MonitorFdHup()
     {
-        close(notifyPipe.writeSide.get());
+        notifyPipe.writeSide.close();
         thread.join();
     }
 };