diff --git a/libavcodec/r210enc.c b/libavcodec/r210enc.c
index 91e3452874..ec1ebc8d60 100644
--- a/libavcodec/r210enc.c
+++ b/libavcodec/r210enc.c
@@ -35,7 +35,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
 
     avctx->bits_per_coded_sample = 32;
     if (avctx->width > 0)
-        avctx->bit_rate = ff_guess_coded_bitrate(avctx) * aligned_width / avctx->width;
+        avctx->bit_rate = av_rescale(ff_guess_coded_bitrate(avctx), aligned_width, avctx->width);
 
     return 0;
 }