diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index 13b7482485..425de8dce5 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -1696,8 +1696,8 @@ int ff_h264_decode_slice_header(H264Context *h, H264Context *h0)
                                   (const uint8_t **)prev->f.data,
                                   prev->f.linesize,
                                   prev->f.format,
-                                  h->mb_width  * 16,
-                                  h->mb_height * 16);
+                                  prev->f.width,
+                                  prev->f.height);
                     h->short_ref[0]->poc = prev->poc + 2;
                 }
                 h->short_ref[0]->frame_num = h->prev_frame_num;