diff --git a/src/decoder/plugins/FfmpegIo.cxx b/src/decoder/plugins/FfmpegIo.cxx
index 9ce80f4b7..2e22d9599 100644
--- a/src/decoder/plugins/FfmpegIo.cxx
+++ b/src/decoder/plugins/FfmpegIo.cxx
@@ -21,6 +21,7 @@
 #define __STDC_CONSTANT_MACROS
 
 #include "FfmpegIo.hxx"
+#include "libavutil/mem.h"
 #include "../DecoderAPI.hxx"
 #include "input/InputStream.hxx"