diff --git a/test/pcm.c b/test/pcm.c
index 5f2de4d7..02a9639e 100644
--- a/test/pcm.c
+++ b/test/pcm.c
@@ -17,6 +17,7 @@ void setformat( void *phandle, void *rhandle )
   int err;
   snd_pcm_format_t format;
   
+  bzero(&format, sizeof(format));
   format.format = SND_PCM_SFMT_S16_LE;
   format.channels = 2;
   format.rate = 22050;