diff --git a/pkgs/desktops/mate/mate-system-monitor/default.nix b/pkgs/by-name/ma/mate-system-monitor/package.nix
similarity index 100%
rename from pkgs/desktops/mate/mate-system-monitor/default.nix
rename to pkgs/by-name/ma/mate-system-monitor/package.nix
diff --git a/pkgs/desktops/mate/default.nix b/pkgs/desktops/mate/default.nix
index aa6eddeda42d..cf3da48776f9 100644
--- a/pkgs/desktops/mate/default.nix
+++ b/pkgs/desktops/mate/default.nix
@@ -29,7 +29,6 @@ let
       mate-panel-with-applets = callPackage ./mate-panel/with-applets.nix { };
       mate-settings-daemon = callPackage ./mate-settings-daemon { };
       mate-settings-daemon-wrapped = callPackage ./mate-settings-daemon/wrapped.nix { };
-      mate-system-monitor = callPackage ./mate-system-monitor { };
 
       mate-terminal = callPackage ./mate-terminal { };
       mate-themes = callPackage ./mate-themes { };
@@ -128,4 +127,5 @@ lib.makeScope pkgs.newScope packages
   mate-screensaver = lib.warnOnInstantiate "‘mate.mate-screensaver’ was moved to top-level. Please use ‘pkgs.mate-screensaver’ directly" pkgs.mate-screensaver; # Added on 2026-02-08
   mate-sensors-applet = lib.warnOnInstantiate "‘mate.mate-sensors-applet’ was moved to top-level. Please use ‘pkgs.mate-sensors-applet’ directly" pkgs.mate-sensors-applet; # Added on 2026-02-08
   mate-session-manager = lib.warnOnInstantiate "‘mate.mate-session-manager’ was moved to top-level. Please use ‘pkgs.mate-session-manager’ directly" pkgs.mate-session-manager; # Added on 2026-02-08
+  mate-system-monitor = lib.warnOnInstantiate "‘mate.mate-system-monitor’ was moved to top-level. Please use ‘pkgs.mate-system-monitor’ directly" pkgs.mate-system-monitor; # Added on 2026-02-08
 }