diff --git a/libav/avformat.h b/libav/avformat.h
index dd37a930b1e7801d798f9eabaaeb222f87f677cc..0ea10f7dfe1e7748a8717535e410ea4e19984b81 100644
--- a/libav/avformat.h
+++ b/libav/avformat.h
@@ -344,6 +344,8 @@ void url_split(char *proto, int proto_size,
                char *path, int path_size,
                const char *url);
 
+int match_ext(const char *filename, const char *extensions);
+
 #endif /* HAVE_AV_CONFIG_H */
 
 #endif /* AVFORMAT_H */