diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 2c170b4fc..6b8bd5663 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+2015-04-09  Corinna Vinschen  <corinna@vinschen.de>
+
+	* fhandler_dsp.cc (fhandler_dev_dsp::open): Call open_null.
+
 2015-04-08  Corinna Vinschen  <corinna@vinschen.de>
 
 	* pwdgrp.h (sidfromuid): New inline function.
diff --git a/winsup/cygwin/fhandler_dsp.cc b/winsup/cygwin/fhandler_dsp.cc
index b5eaba7be..9fa2c6e03 100644
--- a/winsup/cygwin/fhandler_dsp.cc
+++ b/winsup/cygwin/fhandler_dsp.cc
@@ -1037,7 +1037,7 @@ fhandler_dev_dsp::fixup_after_exec ()
 
 
 int
-fhandler_dev_dsp::open (int flags, mode_t mode)
+fhandler_dev_dsp::open (int flags, mode_t)
 {
   int ret = 0, err = 0;
   UINT num_in = 0, num_out = 0;
@@ -1068,7 +1068,7 @@ fhandler_dev_dsp::open (int flags, mode_t mode)
   if (err)
     set_errno (err);
   else
-    ret = fhandler_base::open (flags, mode);
+    ret = open_null (flags);
 
   debug_printf ("ACCMODE=%y audio_in=%d audio_out=%d, err=%d, ret=%d",
 		flags & O_ACCMODE, num_in, num_out, err, ret);