diff --git a/lib/marcel/mime_type/definitions.rb b/lib/marcel/mime_type/definitions.rb
index 65db8bb..9388d6d 100644
--- a/lib/marcel/mime_type/definitions.rb
+++ b/lib/marcel/mime_type/definitions.rb
@@ -33,6 +33,7 @@
 Marcel::MimeType.extend "application/vnd.apple.keynote", extensions: %w( key ), parents: "application/zip"
 
 Marcel::MimeType.extend "audio/aac", extensions: %w( aac ), parents: "audio/x-aac"
+Marcel::MimeType.extend("audio/ogg", extensions: %w( opus ), magic: [[0, 'OggS', [[28, 'OpusHead']]]])
 Marcel::MimeType.extend("audio/ogg", extensions: %w( ogg oga ), magic: [[0, 'OggS', [[29, 'vorbis']]]])
 
 Marcel::MimeType.extend "image/vnd.dwg", magic: [[0, "AC10"]]
diff --git a/test/fixtures/magic/audio/ogg.opus b/test/fixtures/magic/audio/ogg.opus
new file mode 100644
index 0000000..1250c6f
Binary files /dev/null and b/test/fixtures/magic/audio/ogg.opus differ
diff --git a/test/fixtures/name/audio/ogg.opus b/test/fixtures/name/audio/ogg.opus
new file mode 100644
index 0000000..1250c6f
Binary files /dev/null and b/test/fixtures/name/audio/ogg.opus differ