diff --git a/sys/dev/usb/uaudio.c b/sys/dev/usb/uaudio.c
index c4368c04b559..554d277f3eed 100644
--- a/sys/dev/usb/uaudio.c
+++ b/sys/dev/usb/uaudio.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: uaudio.c,v 1.75 2004/07/09 18:08:00 mycroft Exp $	*/
+/*	$NetBSD: uaudio.c,v 1.76 2004/07/16 20:08:23 mycroft Exp $	*/
 
 /*
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -44,7 +44,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uaudio.c,v 1.75 2004/07/09 18:08:00 mycroft Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uaudio.c,v 1.76 2004/07/16 20:08:23 mycroft Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -2368,9 +2368,13 @@ uaudio_set_params(void *addr, int setmode, int usemode,
 	if ((usemode & AUMODE_RECORD) && sc->sc_recchan.altidx != -1)
 		sc->sc_alts[sc->sc_recchan.altidx].sc_busy = 0;
 
+	/* Some uaudio devices are unidirectional.  Don't try to find a
+	   matching mode for the unsupported direction. */
+	setmode &= sc->sc_mode;
+
 	for (mode = AUMODE_RECORD; mode != -1;
 	     mode = mode == AUMODE_RECORD ? AUMODE_PLAY : -1) {
-		if ((setmode & sc->sc_mode & mode) == 0)
+		if ((setmode & mode) == 0)
 			continue;
 
 		p = (mode == AUMODE_PLAY) ? play : rec;