diff --git a/nix/configurations/vanadium/home/misc.nix b/nix/configurations/vanadium/home/misc.nix
index 7fc0c785..33210803 100644
--- a/nix/configurations/vanadium/home/misc.nix
+++ b/nix/configurations/vanadium/home/misc.nix
@@ -55,15 +55,10 @@
     type = "fcitx5";
   };
 
-  xdg.mimeApps =
-    let
-      associations = {
-        "x-scheme-handler/mailto" = [ "org.gnome.Evolution.desktop" ];
-      };
-    in
-    {
-      enable = true;
-      associations.added = associations;
-      defaultApplications = associations;
+  xdg.mimeApps = {
+    enable = true;
+    defaultApplications = {
+      "x-scheme-handler/mailto" = [ "org.gnome.Evolution.desktop" ];
     };
+  };
 }
diff --git a/nix/configurations/vanadium/home/programs.nix b/nix/configurations/vanadium/home/programs.nix
index a05cb216..f7030c31 100644
--- a/nix/configurations/vanadium/home/programs.nix
+++ b/nix/configurations/vanadium/home/programs.nix
@@ -102,7 +102,6 @@
     pkgs.mousai
     pkgs.localsend # file share with iOS
     pkgs.minder # mindmap tool
-    pkgs.mkvtoolnix
 
     # social
     pkgs.iamb
diff --git a/nix/homeModules/common/firefox.nix b/nix/homeModules/common/firefox.nix
index d479571b..556a528d 100644
--- a/nix/homeModules/common/firefox.nix
+++ b/nix/homeModules/common/firefox.nix
@@ -129,20 +129,15 @@ in
     };
   };
 
-  xdg.mimeApps =
-    let
-      # source: https://unix.stackexchange.com/a/684582
-      associations = {
-        "text/html" = "firefox.desktop";
-        "x-scheme-handler/http" = "firefox.desktop";
-        "x-scheme-handler/https" = "firefox.desktop";
-        "x-scheme-handler/about" = "firefox.desktop";
-        "x-scheme-handler/unknown" = "firefox.desktop";
-      };
-    in
-    lib.mkIf cfg.enable {
-      enable = true;
-      associations.added = associations;
-      defaultApplications = associations;
+  xdg.mimeApps = lib.mkIf cfg.enable {
+    enable = true;
+    # source: https://unix.stackexchange.com/a/684582
+    defaultApplications = {
+      "text/html" = "firefox.desktop";
+      "x-scheme-handler/http" = "firefox.desktop";
+      "x-scheme-handler/https" = "firefox.desktop";
+      "x-scheme-handler/about" = "firefox.desktop";
+      "x-scheme-handler/unknown" = "firefox.desktop";
     };
+  };
 }
diff --git a/nix/homeModules/common/sioyek.nix b/nix/homeModules/common/sioyek.nix
index 93ee594d..6547d74d 100644
--- a/nix/homeModules/common/sioyek.nix
+++ b/nix/homeModules/common/sioyek.nix
@@ -3,9 +3,6 @@
   lib,
   ...
 }:
-let
-  cfg = config.programs.sioyek;
-in
 {
   programs.sioyek = {
     bindings = {
@@ -31,15 +28,10 @@ in
     config.should_launch_new_window = "1";
   };
 
-  xdg.mimeApps =
-    let
-      associations = {
-        "application/pdf" = [ "sioyek.desktop" ];
-      };
-    in
-    lib.mkIf cfg.enable {
-      enable = true;
-      associations.added = associations;
-      defaultApplications = associations;
+  xdg.mimeApps = lib.mkIf config.programs.sioyek.enable {
+    enable = true;
+    defaultApplications = {
+      "application/pdf" = [ "sioyek.desktop" ];
     };
+  };
 }