diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index aad7435ae8..02fa1746c4 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -249,7 +249,9 @@ void av_register_all(void)
     av_register_input_format(&nut_demuxer);
 #endif
 #ifdef CONFIG_NUT_MUXER
-//    av_register_output_format(&nut_muxer);
+#ifdef CONFIG_LIBNUT
+    av_register_output_format(&nut_muxer);
+#endif
 #endif
 #ifdef CONFIG_NUV_DEMUXER
     av_register_input_format(&nuv_demuxer);