diff --git a/gnu/packages/jami.scm b/gnu/packages/jami.scm
index 160d0f560b..b8210bcc1e 100644
--- a/gnu/packages/jami.scm
+++ b/gnu/packages/jami.scm
@@ -181,7 +181,7 @@ (define %ffmpeg-default-configure-flags
     "--enable-muxer=h263"
     "--enable-muxer=h264"
     "--enable-muxer=hevc"
-;    "--enable-muxer=matroska"
+    "--enable-muxer=matroska"
     "--enable-muxer=webm"
     "--enable-muxer=ogg"
     "--enable-muxer=pcm_s16be"