diff --git a/profiles/base/default.nix b/profiles/base/default.nix
index fed0a0f..0a853ff 100644
--- a/profiles/base/default.nix
+++ b/profiles/base/default.nix
@@ -184,6 +184,7 @@ in {
       defaultApplications = {
         "image/png" = [ "sxiv.desktop" "gimp.desktop" ];
         "text/plain" = [ "gedit.desktop" "kakoune.desktop" "code.desktop" ];
+        "video/x-matroska" = [ "mpv.desktop" ];
       };
       associations.removed = {
         "text/plain" = [ "writer.desktop" ];