diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 6ba750f11a..aa767f3535 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1219,9 +1219,9 @@ AVOutputFormat ff_matroska_muxer = {
     .write_header      = mkv_write_header,
     .write_packet      = mkv_write_packet,
     .write_trailer     = mkv_write_trailer,
-    .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
-    .codec_tag = (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, 0},
-    .subtitle_codec = CODEC_ID_SSA,
+    .flags             = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
+    .codec_tag         = (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, 0},
+    .subtitle_codec    = CODEC_ID_SSA,
     .query_codec       = mkv_query_codec,
 };
 #endif