diff --git a/libavcodec/videotoolbox.c b/libavcodec/videotoolbox.c
index 08b133e1b1c15..279180179d8d4 100644
--- a/libavcodec/videotoolbox.c
+++ b/libavcodec/videotoolbox.c
@@ -73,6 +73,7 @@ static int videotoolbox_buffer_copy(VTContext *vtctx,
 
 static int videotoolbox_postproc_frame(void *avctx, AVFrame *frame)
 {
+    VTContext *vtctx = ((AVCodecContext *)avctx)->internal->hwaccel_priv_data;
     CVPixelBufferRef ref = *(CVPixelBufferRef *)frame->buf[0]->data;
 
     if (!ref) {
@@ -83,6 +84,11 @@ static int videotoolbox_postproc_frame(void *avctx, AVFrame *frame)
 
     frame->data[3] = (uint8_t*)ref;
 
+    if (!frame->hw_frames_ctx)
+        frame->hw_frames_ctx = av_buffer_ref(vtctx->cached_hw_frames_ctx);
+    if (!frame->hw_frames_ctx)
+        return AVERROR(ENOMEM);
+
     return 0;
 }