diff --git a/libavcodec/mpeg12enc.c b/libavcodec/mpeg12enc.c
index e35c916b61..42c0f94930 100644
--- a/libavcodec/mpeg12enc.c
+++ b/libavcodec/mpeg12enc.c
@@ -330,7 +330,7 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
     else
         /* VBV calculation: Scaled so that a VCD has the proper
          * VBV size of 40 kilobytes */
-        vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
+        vbv_buffer_size = av_rescale_rnd(s->bit_rate, 20, 1151929 / 2, AV_ROUND_ZERO) * 8 * 1024;
     vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
 
     put_sbits(&s->pb, 18, v);