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-rw-r--r--nixos/modules/services/x11/window-managers/xmonad.nix2
1 files changed, 2 insertions, 0 deletions
diff --git a/nixos/modules/services/x11/window-managers/xmonad.nix b/nixos/modules/services/x11/window-managers/xmonad.nix
index a8f38046137..ecad411ff68 100644
--- a/nixos/modules/services/x11/window-managers/xmonad.nix
+++ b/nixos/modules/services/x11/window-managers/xmonad.nix
@@ -39,10 +39,12 @@ in {
   options = {
     services.xserver.windowManager.xmonad = {
       enable = mkEnableOption "xmonad";
+
       haskellPackages = mkOption {
         default = pkgs.haskellPackages;
         defaultText = literalExpression "pkgs.haskellPackages";
         example = literalExpression "pkgs.haskell.packages.ghc784";
+        type = types.attrs;
         description = ''
           haskellPackages used to build Xmonad and other packages.
           This can be used to change the GHC version used to build