diff --git a/system/ids.nix b/system/ids.nix
index 71f8a6d583cc..312fd94e351e 100644
--- a/system/ids.nix
+++ b/system/ids.nix
@@ -25,7 +25,10 @@
   gids = {
     root = 0;
     wheel = 1;
+    kmem = 2;
+    tty = 3;
     haldaemon = 5;
+    disk = 6;
     vsftpd = 7;
     ftp = 8;
     bitlbee = 9;
@@ -35,8 +38,10 @@
     postfix = 13;
     postdrop = 14;
     dovecot = 15;
-
     audio = 17;
+    floppy = 18;
+    uucp = 19;
+    lp = 20;
 
     users = 100;
     nixbld = 30000;
diff --git a/system/users-groups.nix b/system/users-groups.nix
index 19a8ff9c9729..7aeeddaa3a1b 100644
--- a/system/users-groups.nix
+++ b/system/users-groups.nix
@@ -62,6 +62,24 @@ rec {
           { name = "wheel";
             gid = ids.gids.wheel;
           }
+          { name = "disk";
+            gid = ids.gids.disk;
+          }
+          { name = "kmem";
+            gid = ids.gids.kmem;
+          }
+          { name = "tty";
+            gid = ids.gids.tty;
+          }
+          { name = "floppy";
+            gid = ids.gids.floppy;
+          }
+          { name = "uucp";
+            gid = ids.gids.uucp;
+          }
+          { name = "lp";
+            gid = ids.gids.lp;
+          }
           { name = "nogroup";
             gid = ids.gids.nogroup;
           }