diff --git a/libavcodec/vaapi_encode_h265.c b/libavcodec/vaapi_encode_h265.c
index 538862a9d5..97dc5a7e75 100644
--- a/libavcodec/vaapi_encode_h265.c
+++ b/libavcodec/vaapi_encode_h265.c
@@ -410,10 +410,10 @@ static int vaapi_encode_h265_init_sequence_params(AVCodecContext *avctx)
         sps->conformance_window_flag = 1;
         sps->conf_win_left_offset   = 0;
         sps->conf_win_right_offset  =
-            (ctx->surface_width - avctx->width) / 2;
+            (ctx->surface_width - avctx->width) >> desc->log2_chroma_w;
         sps->conf_win_top_offset    = 0;
         sps->conf_win_bottom_offset =
-            (ctx->surface_height - avctx->height) / 2;
+            (ctx->surface_height - avctx->height) >> desc->log2_chroma_h;
     } else {
         sps->conformance_window_flag = 0;
     }