diff --git a/pkgs/desktops/plasma-5.4/default.nix b/pkgs/desktops/plasma-5.4/default.nix
index 152bc3510679..172acb08a053 100644
--- a/pkgs/desktops/plasma-5.4/default.nix
+++ b/pkgs/desktops/plasma-5.4/default.nix
@@ -82,6 +82,6 @@ let
     systemsettings = callPackage ./systemsettings.nix {};
   };
 
-  newScope = scope: kdeApps.newScope (scope // { inherit mkDerivation; });
+  newScope = scope: kdeApps.newScope ({ inherit mkDerivation; } // scope);
 
 in lib.makeScope newScope addPackages