diff --git a/CREDITS.md b/CREDITS.md
index 527e0a9..7b2d5ec 100644
--- a/CREDITS.md
+++ b/CREDITS.md
@@ -37,6 +37,7 @@ hatsch<br>
 [Matthias Bilger](https://codeberg.org/m42e)<br>
 [Meljoann](https://www.meljoann.com/)<br>
 [Michael Fritzsch](https://codeberg.org/michael-fritzsch)<br>
+[namatoj](https://autonomous.zone/@namatoj)<br>
 [Robert Pfotenhauer](https://pftnhr.xyz)<br>
 [Sam](https://ethicalrevolution.co.uk/)<br>
 [Sam Muirhead](https://www.animate-activate.studio/)<br>
diff --git a/core/src/video_file.rs b/core/src/video_file.rs
index 456a9d4..6a3f0b4 100644
--- a/core/src/video_file.rs
+++ b/core/src/video_file.rs
@@ -72,7 +72,7 @@ impl VideoFile {
         // This mapping must be kept up-to-date with
         // [SUPPORTED_EXTENSIONS], otherwise it's a full on-crash somewhere
         // (but at least something that is quickly and easily discovered).
-        match extension {
+        match extension.to_ascii_lowercase().as_str() {
             "m4v" |
             "mp4" => "video/mp4",
             "mkv" => "video/x-matroska",