diff --git a/sound/oss/sb_audio.c b/sound/oss/sb_audio.c
index b2b3c01..048439a 100644
--- a/sound/oss/sb_audio.c
+++ b/sound/oss/sb_audio.c
@@ -442,7 +442,7 @@
 {
 	sb_devc *devc = audio_devs[dev]->devc;
 	int tmp;
-	int s = speed * devc->channels;
+	int s;
 
 	if (speed > 0)
 	{
@@ -452,6 +452,7 @@
 			speed = 44100;
 		if (devc->opened & OPEN_READ && speed > 15000)
 			speed = 15000;
+		s = speed * devc->channels;
 		devc->tconst = (256 - ((1000000 + s / 2) / s)) & 0xff;
 		tmp = 256 - devc->tconst;
 		speed = ((1000000 + tmp / 2) / tmp) / devc->channels;