diff --git a/options/machine.nix b/options/machine.nix
index c78e1f0..a2e29cc 100644
--- a/options/machine.nix
+++ b/options/machine.nix
@@ -11,19 +11,19 @@ with lib;
       '';
     };
     pkgs = mkOption {
-      type = types.listOf types.string;
+      type = types.listOf types.str;
       description = ''
         The list of metapackages to be installed.
       '';
     };
     services = mkOption {
-      type = types.listOf types.string;
+      type = types.listOf types.str;
       description = ''
         List of services to be enabled.
       '';
     };
     conffiles = mkOption {
-      type = types.listOf types.string;
+      type = types.listOf types.str;
       description = ''
         List of configuration files to be enabled.
       '';
@@ -35,7 +35,7 @@ with lib;
       '';
     };
     secretPath = mkOption {
-      type = types.string;
+      type = types.str;
       default = "/secret";
       description = ''
         Path to you systems secret folder containing files with sensitive information.
@@ -67,7 +67,7 @@ with lib;
       '';
     };
     desktop.wms = mkOption {
-      type = types.listOf types.string;
+      type = types.listOf types.str;
       default = [];
       description = ''
         The list of wms to be enabled.