diff --git a/NEWS b/NEWS
index 97be2092a..4e93c8926 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,6 @@
 ver 0.23.4 (not yet released)
+* decoder
+  - ffmpeg: support libavcodec 59
 * output
   - alsa: add option "thesycon_dsd_workaround" to work around device bug
 * fix crash on debug builds if startup fails
diff --git a/src/decoder/plugins/FfmpegDecoderPlugin.cxx b/src/decoder/plugins/FfmpegDecoderPlugin.cxx
index c0ebc7b97..c44addeea 100644
--- a/src/decoder/plugins/FfmpegDecoderPlugin.cxx
+++ b/src/decoder/plugins/FfmpegDecoderPlugin.cxx
@@ -502,7 +502,7 @@ FfmpegDecode(DecoderClient &client, InputStream *input,
 		FmtDebug(ffmpeg_domain, "codec '{}'",
 			 codec_descriptor->name);
 
-	AVCodec *codec = avcodec_find_decoder(codec_params.codec_id);
+	const AVCodec *codec = avcodec_find_decoder(codec_params.codec_id);
 
 	if (!codec) {
 		LogError(ffmpeg_domain, "Unsupported audio codec");
diff --git a/src/lib/ffmpeg/Codec.hxx b/src/lib/ffmpeg/Codec.hxx
index bb038884f..2437950e5 100644
--- a/src/lib/ffmpeg/Codec.hxx
+++ b/src/lib/ffmpeg/Codec.hxx
@@ -36,7 +36,7 @@ class CodecContext {
 public:
 	CodecContext() = default;
 
-	explicit CodecContext(AVCodec &codec)
+	explicit CodecContext(const AVCodec &codec)
 		:codec_context(avcodec_alloc_context3(&codec))
 	{
 		if (codec_context == nullptr)