diff --git a/src/libs/core/impl/MimeTypes.cpp b/src/libs/core/impl/MimeTypes.cpp
index 1f31a161..79b4f938 100644
--- a/src/libs/core/impl/MimeTypes.cpp
+++ b/src/libs/core/impl/MimeTypes.cpp
@@ -37,7 +37,6 @@ namespace lms::core
             { ".ape", "audio/x-monkeys-audio" },
             { ".dff", "audio/x-dsd-dff" },
             { ".dsdiff", "audio/x-dsd-diff" },
-            { ".dsf", "audio/x-dsd" },
             { ".dsf", "audio/x-dsd-dsf" },
             { ".dts", "audio/vnd.dts" },
             { ".dtshd", "audio/vnd.dts.hd" },
@@ -47,12 +46,11 @@ namespace lms::core
             { ".m4a", "audio/mp4" },
             { ".m4b", "audio/mp4" },
             { ".mka", "audio/x-matroska" },
-            { ".mka", "audio/x-matroska" },
             { ".mp3", "audio/mpeg" },
             { ".mpc", "audio/x-musepack" },
             { ".oga", "audio/ogg" },
             { ".ogg", "audio/ogg" },
-            { ".opus", "audio/opus" },
+            { ".opus", "audio/ogg" },
             { ".pls", "audio/x-scpls" },
             { ".shn", "audio/x-shn" },
             { ".tta", "audio/x-tta" },
diff --git a/src/libs/core/impl/media/MimeType.cpp b/src/libs/core/impl/media/MimeType.cpp
index ef17cba3..eb8f20f3 100644
--- a/src/libs/core/impl/media/MimeType.cpp
+++ b/src/libs/core/impl/media/MimeType.cpp
@@ -56,7 +56,7 @@ namespace lms::core::media
             switch (codec)
             {
             case Codec::Opus:
-                return "audio/opus";
+                return "audio/ogg; codecs=\"opus\"";
             case Codec::Vorbis:
                 return "audio/ogg; codecs=\"vorbis\"";
             case Codec::FLAC: