diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index d316a0529a..73d69cda99 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -210,7 +210,6 @@ extern AVInputFormat  ff_ivr_demuxer;
 extern AVInputFormat  ff_jacosub_demuxer;
 extern AVOutputFormat ff_jacosub_muxer;
 extern AVInputFormat  ff_jv_demuxer;
-extern AVInputFormat  ff_kux_demuxer;
 extern AVOutputFormat ff_latm_muxer;
 extern AVInputFormat  ff_lmlm4_demuxer;
 extern AVInputFormat  ff_loas_demuxer;