diff --git a/system/nixos-environment.nix b/system/nixos-environment.nix
new file mode 100644
index 000000000000..a2e0ae46cdf0
--- /dev/null
+++ b/system/nixos-environment.nix
@@ -0,0 +1,67 @@
+
+{pkgs, config, ...}:
+let
+  inherit (pkgs.lib) mergeOneOption mkOption mkIf;
+in
+{
+  require = [ 
+  {
+
+    environment = {
+      checkConfigurationOptions = mkOption {
+        default = true;
+        example = false;
+        description = "
+          If all configuration options must be checked. Non-existing options fail build.
+        ";
+      };
+
+      nix = mkOption {
+        default = pkgs.nixUnstable;
+        example = pkgs.nixCustomFun /root/nix.tar.gz;
+        merge = mergeOneOption;
+        description = "
+          Use non-default Nix easily. Be careful, though, not to break everything.
+        ";
+      };
+
+      extraPackages = mkOption {
+        default = [];
+        example = [pkgs.firefox pkgs.thunderbird];
+        description = "
+          This option allows you to add additional packages to the system
+          path.  These packages are automatically available to all users,
+          and they are automatically updated every time you rebuild the
+          system configuration.  (The latter is the main difference with
+          installing them in the default profile,
+          <filename>/nix/var/nix/profiles/default</filename>.  The value
+          of this option must be a function that returns a list of
+          packages.  The function will be called with the Nix Packages
+          collection as its argument for convenience.
+        ";
+      };
+
+
+      pathsToLink = mkOption {
+        default = ["/bin" "/sbin" "/lib" "/share" "/man" "/info" "/etc"];
+        example = ["/"];
+        description = "
+          Lists directories to be symlinked in `/var/run/current-system/sw'.
+        ";
+      };
+
+      cleanStart = mkOption {
+        default = false;
+        example = true;
+        description = "
+          There are some times when you want really small system for specific 
+          purpose and do not want default package list. Setting 
+          <varname>cleanStart</varname> to <literal>true</literal> allows you 
+          to create a system with empty path - only extraPackages will be 
+          included.
+        ";
+      };
+    };
+  }
+  ];
+}
diff --git a/system/options.nix b/system/options.nix
index 9e30c5053453..c0e09721259c 100644
--- a/system/options.nix
+++ b/system/options.nix
@@ -2116,64 +2116,6 @@ in
   };
 
 
-  environment = {
-
-    pathsToLink = mkOption {
-      default = ["/bin" "/sbin" "/lib" "/share" "/man" "/info" "/etc"];
-      example = ["/"];
-      description = "
-        Lists directories to be symlinked in `/var/run/current-system/sw'.
-      ";
-    };
-
-    cleanStart = mkOption {
-      default = false;
-      example = true;
-      description = "
-        There are some times when you want really small system for specific 
-        purpose and do not want default package list. Setting 
-        <varname>cleanStart</varname> to <literal>true</literal> allows you 
-        to create a system with empty path - only extraPackages will be 
-        included.
-      ";
-    };
-
-    extraPackages = mkOption {
-      default = [];
-      example = [pkgs.firefox pkgs.thunderbird];
-      description = "
-        This option allows you to add additional packages to the system
-        path.  These packages are automatically available to all users,
-        and they are automatically updated every time you rebuild the
-        system configuration.  (The latter is the main difference with
-        installing them in the default profile,
-        <filename>/nix/var/nix/profiles/default</filename>.  The value
-        of this option must be a function that returns a list of
-        packages.  The function will be called with the Nix Packages
-        collection as its argument for convenience.
-      ";
-    };
-
-    nix = mkOption {
-      default = pkgs.nixUnstable;
-      example = pkgs.nixCustomFun /root/nix.tar.gz;
-      merge = mergeOneOption;
-      description = "
-        Use non-default Nix easily. Be careful, though, not to break everything.
-      ";
-    };
-
-    checkConfigurationOptions = mkOption {
-      default = true;
-      example = false;
-      description = "
-        If all configuration options must be checked. Non-existing options fail build.
-      ";
-    };
-
-  };
-
-    
   nesting = {
     children = mkOption {
       default = [];
@@ -2215,6 +2157,8 @@ in
     # environment
     (import ../etc/default.nix)
 
+    (import ../system/nixos-environment.nix)
+
     # users
     (import ../system/users-groups.nix)