diff --git a/users/simon/modules/email.nix b/users/simon/modules/email.nix
index 4c138a3..aa8d72d 100644
--- a/users/simon/modules/email.nix
+++ b/users/simon/modules/email.nix
@@ -150,7 +150,7 @@ in
         nm_default_uri = "notmuch:///home/simon/.local/share/mail";
 
         mailcap_path = pkgs.writeText "mutt-mailcap" ''
-          text/html; firefox %s
+          text/html; ${config.xdg.mimeApps.defaultApplications."text/html"} %s
           text/html; ${pkgs.w3m}/bin/w3m -I %{charset} -T text/html -dump; copiousoutput;
           application/pdf; zathura %s
           image/*; mpv %s