diff --git a/libavcodec/x86/w64xmmtest.c b/libavcodec/x86/w64xmmtest.c
index 7d4a6630c2..987fa51e26 100644
--- a/libavcodec/x86/w64xmmtest.c
+++ b/libavcodec/x86/w64xmmtest.c
@@ -23,7 +23,7 @@
 #include "libavutil/x86/w64xmmtest.h"
 
 wrap(avcodec_open2(AVCodecContext *avctx,
-                   AVCodec *codec,
+                   const AVCodec *codec,
                    AVDictionary **options))
 {
     testxmmclobbers(avcodec_open2, avctx, codec, options);