diff --git a/pkgs/by-name/gr/grimorie/package.nix b/pkgs/by-name/gr/grimorie/package.nix
index cc1e4c8..ce29e46 100644
--- a/pkgs/by-name/gr/grimorie/package.nix
+++ b/pkgs/by-name/gr/grimorie/package.nix
@@ -41,7 +41,7 @@
     exec = "$out/bin/grimoire %u";
     desktopName = "Grimoire";
     categories = ["Utility"];
-    MimeType = "x-scheme-handler/grimoire";
+    mimeTypes = ["x-scheme-handler/grimoire"];
   };
 in
   stdenv.mkDerivation {