diff --git a/NEWS b/NEWS
index 76fe8a886..704af63c1 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,6 @@
 ver 0.23.9 (not yet released)
+* decoder
+  - ffmpeg: support FFmpeg 5.1
 * output
   - pipewire: set app icon
 * improve iconv detection
diff --git a/src/decoder/plugins/FfmpegIo.cxx b/src/decoder/plugins/FfmpegIo.cxx
index 2e22d9599..5b5c8b40e 100644
--- a/src/decoder/plugins/FfmpegIo.cxx
+++ b/src/decoder/plugins/FfmpegIo.cxx
@@ -21,10 +21,13 @@
 #define __STDC_CONSTANT_MACROS
 
 #include "FfmpegIo.hxx"
-#include "libavutil/mem.h"
 #include "../DecoderAPI.hxx"
 #include "input/InputStream.hxx"
 
+extern "C" {
+#include <libavutil/mem.h>
+}
+
 AvioStream::~AvioStream()
 {
 	if (io != nullptr) {