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-rw-r--r--nixos/modules/services/x11/window-managers/xmonad.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixos/modules/services/x11/window-managers/xmonad.nix b/nixos/modules/services/x11/window-managers/xmonad.nix
index 6af88d4f645..588696dac15 100644
--- a/nixos/modules/services/x11/window-managers/xmonad.nix
+++ b/nixos/modules/services/x11/window-managers/xmonad.nix
@@ -16,6 +16,7 @@ in
     services.xserver.windowManager.xmonad = {
       enable = mkEnableOption "xmonad";
       haskellPackages = mkOption {
+        type = lib.types.packageSet;
         default = pkgs.haskellPackages;
         defaultText = "pkgs.haskellPackages";
         example = literalExample "pkgs.haskell.packages.ghc784";