diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 0b15b59364..623db2a9fa 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -766,10 +766,11 @@ extern const AVCodec ff_libx262_encoder;
 #if CONFIG_LIBX264_ENCODER
 #include <x264.h>
 #if X264_BUILD < 153
-extern AVCodec ff_libx264_encoder;
+#define LIBX264_CONST
 #else
-extern const AVCodec ff_libx264_encoder;
+#define LIBX264_CONST const
 #endif
+extern LIBX264_CONST AVCodec ff_libx264_encoder;
 #endif
 extern const AVCodec ff_libx264rgb_encoder;
 extern AVCodec ff_libx265_encoder;