diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index ede9a1a6ea..ade874b70e 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -1269,15 +1269,14 @@ static int h264_export_frame_props(H264Context *h)
         }
     }

-    if (h->sei.a53_caption.a53_caption) {
+    if (h->sei.a53_caption.buf_ref) {
         H264SEIA53Caption *a53 = &h->sei.a53_caption;
-        AVFrameSideData *sd = av_frame_new_side_data(cur->f,
+        AVFrameSideData *sd = av_frame_new_side_data_from_buf(cur->f,
                                                      AV_FRAME_DATA_A53_CC,
-                                                     a53->a53_caption_size);
-        if (sd)
-            memcpy(sd->data, a53->a53_caption, a53->a53_caption_size);
-        av_freep(&a53->a53_caption);
-        a53->a53_caption_size = 0;
+                                                     a53->buf_ref);
+        if (!sd) {
+            av_buffer_unref(&a53->buf_ref);
+        a53->buf_ref = NULL;
         h->avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
     }