diff --git a/ChangeLog b/ChangeLog
index cff07bd0a0..1d90d50a58 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2007-12-08  Jan Schmidt  <jan.schmidt@sun.com>
+
+	* sys/oss/gstosshelper.c:
+	Verify that the format returned after the ioctl is the one
+	we requested. It is valid for the ioctl to succeed while
+	substituting an alternate 'supported' sample format.
+
 2007-12-07  Tim-Philipp Müller  <tim at centricular dot net>
 
 	* sys/oss/gstossaudio.c: (plugin_init):
diff --git a/sys/oss/gstosshelper.c b/sys/oss/gstosshelper.c
index 38b36893ca..dea22ccfbd 100644
--- a/sys/oss/gstosshelper.c
+++ b/sys/oss/gstosshelper.c
@@ -352,7 +352,7 @@ gst_oss_helper_rate_check_rate (GstOssProbe * probe, int irate)
   GST_LOG ("checking format %d, channels %d, rate %d",
       format, n_channels, rate);
   ret = ioctl (probe->fd, SNDCTL_DSP_SETFMT, &format);
-  if (ret < 0)
+  if (ret < 0 || format != probe->format)
     return -1;
   ret = ioctl (probe->fd, SNDCTL_DSP_CHANNELS, &n_channels);
   if (ret < 0)