diff --git a/libavcodec/mfenc.c b/libavcodec/mfenc.c
index 3c50a6c074..204728b038 100644
--- a/libavcodec/mfenc.c
+++ b/libavcodec/mfenc.c
@@ -248,7 +248,7 @@ static int mf_sample_to_avpacket(AVCodecContext *avctx, IMFSample *sample, AVPac
     if ((ret = ff_get_encode_buffer(avctx, avpkt, len, 0)) < 0)
         return ret;
 
-    IMFSample_ConvertToContiguousBuffer(sample, &buffer);
+    hr = IMFSample_ConvertToContiguousBuffer(sample, &buffer);
     if (FAILED(hr))
         return AVERROR_EXTERNAL;