diff --git a/winsup/cygwin/fhandler/dsp.cc b/winsup/cygwin/fhandler/dsp.cc
index 5f78821d4..03c812a9c 100644
--- a/winsup/cygwin/fhandler/dsp.cc
+++ b/winsup/cygwin/fhandler/dsp.cc
@@ -590,7 +590,8 @@ fhandler_dev_dsp::Audio_out::waitforallsent ()
   while (Qisr2app_->query () != fh->fragstotal_)
     {
       debug_printf ("%d blocks in Qisr2app", Qisr2app_->query ());
-      Sleep (100);
+      cygwait (1);
+      sendcurrent ();
     }
 }