diff --git a/modules/demux/voc.c b/modules/demux/voc.c
index 7f7cce990a..f06190f41f 100644
--- a/modules/demux/voc.c
+++ b/modules/demux/voc.c
@@ -350,7 +350,7 @@ static int ReadBlockHeader( demux_t *p_demux )
                 goto corrupt;
 
             new_fmt.audio.i_rate = GetDWLE( buf );
-            if( !new_fmt.audio.i_rate )
+            if( new_fmt.audio.i_rate == 0 || new_fmt.audio.i_rate > 768000 )
                 goto corrupt;
             new_fmt.audio.i_bitspersample = buf[4];
             new_fmt.audio.i_channels = buf[5];