diff --git a/nixos/modules/rename.nix b/nixos/modules/rename.nix
index 4f924b82a9d..ae3c9faeea6 100644
--- a/nixos/modules/rename.nix
+++ b/nixos/modules/rename.nix
@@ -69,9 +69,7 @@ let
 
 in zipModules ([]
 
-# usage example:
-# ++ alias [ "services" "xserver" "slim" "theme" ] [ "services" "xserver" "displayManager" "slim" "theme" ]
-++ obsolete [ "environment" "extraPackages" ] [ "environment" "systemPackages" ]
+++ obsolete [ "environment" "x11Packages" ] [ "environment" "systemPackages" ]
 ++ obsolete [ "environment" "enableBashCompletion" ] [ "programs" "bash" "enableCompletion" ]
 ++ obsolete [ "environment" "nix" ] [ "nix" "package" ]
 
diff --git a/nixos/modules/services/x11/desktop-managers/default.nix b/nixos/modules/services/x11/desktop-managers/default.nix
index 4bf1e33a295..ab3ced4c9e2 100644
--- a/nixos/modules/services/x11/desktop-managers/default.nix
+++ b/nixos/modules/services/x11/desktop-managers/default.nix
@@ -70,7 +70,7 @@ in
 
   config = {
     services.xserver.displayManager.session = cfg.session.list;
-    environment.x11Packages =
+    environment.systemPackages =
       mkIf cfg.session.needBGPackages [ pkgs.feh ];
   };
 }
diff --git a/nixos/modules/services/x11/window-managers/awesome.nix b/nixos/modules/services/x11/window-managers/awesome.nix
index 880ebf1eca6..1c61419a44c 100644
--- a/nixos/modules/services/x11/window-managers/awesome.nix
+++ b/nixos/modules/services/x11/window-managers/awesome.nix
@@ -35,7 +35,7 @@ in
           '';
       };
 
-    environment.x11Packages = [ pkgs.awesome ];
+    environment.systemPackages = [ pkgs.awesome ];
 
   };
 
diff --git a/nixos/modules/services/x11/window-managers/i3.nix b/nixos/modules/services/x11/window-managers/i3.nix
index 6777a95ddc8..e53d86187ae 100644
--- a/nixos/modules/services/x11/window-managers/i3.nix
+++ b/nixos/modules/services/x11/window-managers/i3.nix
@@ -30,14 +30,14 @@ in
     services.xserver.windowManager = {
       session = [{
         name = "i3";
-        start = "
+        start = ''
           ${pkgs.i3}/bin/i3 ${optionalString (cfg.configFile != null)
             "-c \"${cfg.configFile}\""
           } &
           waitPID=$!
-        ";
+        '';
       }];
     };
-    environment.x11Packages = [ pkgs.i3 ];
+    environment.systemPackages = [ pkgs.i3 ];
   };
 }
diff --git a/nixos/modules/services/x11/window-managers/icewm.nix b/nixos/modules/services/x11/window-managers/icewm.nix
index 9da4a415fad..b7da4051c14 100644
--- a/nixos/modules/services/x11/window-managers/icewm.nix
+++ b/nixos/modules/services/x11/window-managers/icewm.nix
@@ -35,7 +35,7 @@ in
           '';
       };
 
-    environment.x11Packages = [ pkgs.icewm ];
+    environment.systemPackages = [ pkgs.icewm ];
 
   };
 
diff --git a/nixos/modules/services/x11/window-managers/openbox.nix b/nixos/modules/services/x11/window-managers/openbox.nix
index ae34a938c4a..46b1945d33e 100644
--- a/nixos/modules/services/x11/window-managers/openbox.nix
+++ b/nixos/modules/services/x11/window-managers/openbox.nix
@@ -25,6 +25,6 @@ in
         ";
       }];
     };
-    environment.x11Packages = [ pkgs.openbox ];
+    environment.systemPackages = [ pkgs.openbox ];
   };
 }
diff --git a/nixos/modules/services/x11/window-managers/twm.nix b/nixos/modules/services/x11/window-managers/twm.nix
index c1a99b97566..d80ffe4942f 100644
--- a/nixos/modules/services/x11/window-managers/twm.nix
+++ b/nixos/modules/services/x11/window-managers/twm.nix
@@ -35,7 +35,7 @@ in
           '';
       };
 
-    environment.x11Packages = [ pkgs.xorg.twm ];
+    environment.systemPackages = [ pkgs.xorg.twm ];
 
   };
 
diff --git a/nixos/modules/services/x11/xserver.nix b/nixos/modules/services/x11/xserver.nix
index 89b6d21ebef..caa0839dbb7 100644
--- a/nixos/modules/services/x11/xserver.nix
+++ b/nixos/modules/services/x11/xserver.nix
@@ -419,15 +419,6 @@ in
 
     };
 
-    environment.x11Packages = mkOption {
-      default = [];
-      type = types.listOf types.package;
-      description = ''
-        List of packages added to the system when the X server is
-        activated (<option>services.xserver.enable</option>).
-      '';
-    };
-
   };
 
 
@@ -477,7 +468,7 @@ in
           }
       ]);
 
-    environment.x11Packages =
+    environment.systemPackages =
       [ xorg.xorgserver
         xorg.xrandr
         xorg.xrdb
@@ -498,8 +489,6 @@ in
       ++ optional (elem "virtualbox" driverNames) xorg.xrefresh
       ++ optional (elem "ati_unfree" driverNames) kernelPackages.ati_drivers_x11;
 
-    environment.systemPackages = config.environment.x11Packages;
-
     environment.pathsToLink =
       [ "/etc/xdg" "/share/xdg" "/share/applications" "/share/icons" "/share/pixmaps" ];