diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index a55ab3474e..acbc525a38 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -2007,7 +2007,7 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
     }
 
     if(s->avctx->time_base.num)
-        s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
+        s->current_picture_ptr->f.pts = ROUNDED_DIV(s->time, s->avctx->time_base.num);
     else
         s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
     if(s->avctx->debug&FF_DEBUG_PTS)