diff --git a/nixos/modules/hardware/pcmcia.nix b/nixos/modules/hardware/pcmcia.nix
index d7d002ae6c8a7..aef35a28e54da 100644
--- a/nixos/modules/hardware/pcmcia.nix
+++ b/nixos/modules/hardware/pcmcia.nix
@@ -35,6 +35,7 @@ in
 
       config = mkOption {
         default = null;
+        type = types.nullOr types.path;
         description = ''
           Path to the configuration file which maps the memory, IRQs
           and ports used by the PCMCIA hardware.
diff --git a/nixos/modules/services/development/hoogle.nix b/nixos/modules/services/development/hoogle.nix
index 7c635f7a5b8d7..7c2a1c8e16247 100644
--- a/nixos/modules/services/development/hoogle.nix
+++ b/nixos/modules/services/development/hoogle.nix
@@ -40,6 +40,7 @@ in {
 
     haskellPackages = mkOption {
       description = "Which haskell package set to use.";
+      type = types.attrs;
       default = pkgs.haskellPackages;
       defaultText = literalExpression "pkgs.haskellPackages";
     };
diff --git a/nixos/modules/services/x11/window-managers/xmonad.nix b/nixos/modules/services/x11/window-managers/xmonad.nix
index a8f38046137a6..ecad411ff6835 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