--- a/libavcodec/libsvtav1.c
+++ b/libavcodec/libsvtav1.c
@@ -179,7 +179,7 @@ static int config_enc_params(EbSvtAv1EncConfiguration *param,
         param->min_qp_allowed       = avctx->qmin;
     }
     param->max_bit_rate             = avctx->rc_max_rate;
-    param->vbv_bufsize              = avctx->rc_buffer_size;
+    param->maximum_buffer_size_ms   = avctx->rc_buffer_size * 1000LL / avctx->bit_rate;
 
     if (svt_enc->crf > 0) {
         param->qp                   = svt_enc->crf;
@@ -296,7 +296,7 @@ static int config_enc_params(EbSvtAv1EncConfiguration *param,
     avctx->bit_rate       = param->rate_control_mode > 0 ?
                             param->target_bit_rate : 0;
     avctx->rc_max_rate    = param->max_bit_rate;
-    avctx->rc_buffer_size = param->vbv_bufsize;
+    avctx->rc_buffer_size = param->maximum_buffer_size_ms * avctx->bit_rate / 1000LL;
 
     if (avctx->bit_rate || avctx->rc_max_rate || avctx->rc_buffer_size) {
         AVCPBProperties *cpb_props = ff_add_cpb_side_data(avctx);