diff --git a/modules/demux/ps.c b/modules/demux/ps.c
index d2db608b83e508b901808a4e57433f98fe851c5a..f7ffc3e8251732962e7f5e0fce5363b418f2d611 100644
--- a/modules/demux/ps.c
+++ b/modules/demux/ps.c
@@ -388,7 +388,9 @@ static int Demux( demux_t *p_demux )
 #endif
                 !ps_pkt_parse_pes( p_pkt, tk->i_skip ) ) )
             {
-                if( !b_new && !p_sys->b_have_pack && tk->fmt.i_cat == AUDIO_ES && p_pkt->i_pts > 0 )
+                if( !b_new && !p_sys->b_have_pack && 
+                    (tk->fmt.i_cat == AUDIO_ES) &&
+                    (p_pkt->i_pts > 0) )
                 {
                     /* A hack to sync the A/V on PES files. */
                     msg_Dbg( p_demux, "force SCR: %"PRId64, p_pkt->i_pts );