diff --git a/nixos/modules/services/x11/desktop-managers/plasma5.nix b/nixos/modules/services/x11/desktop-managers/plasma5.nix
index 17733aa7e4f..83d1957a646 100644
--- a/nixos/modules/services/x11/desktop-managers/plasma5.nix
+++ b/nixos/modules/services/x11/desktop-managers/plasma5.nix
@@ -224,7 +224,7 @@ in
       # Update the start menu for each user that has `isNormalUser` set.
       system.activationScripts.plasmaSetup = stringAfter [ "users" "groups" ]
         (concatStringsSep "\n"
-          (mapAttrsToList (name: value: "${pkgs.su}/bin/su ${name} -c kbuildsycoca5")
+          (mapAttrsToList (name: value: "${pkgs.su}/bin/su ${name} -c ${pkgs.libsForQt5.kservice}/bin/kbuildsycoca5")
             (filterAttrs (n: v: v.isNormalUser) config.users.users)));
     })
   ];