diff --git a/nixos/modules/config/users-groups.nix b/nixos/modules/config/users-groups.nix
index 76092e738ebd..352d6e39435b 100644
--- a/nixos/modules/config/users-groups.nix
+++ b/nixos/modules/config/users-groups.nix
@@ -90,7 +90,7 @@ let
           only has an effect if {option}`uid` is
           {option}`null`, in which case it determines whether
           the user's UID is allocated in the range for system users
-          (below 500) or in the range for normal users (starting at
+          (below 1000) or in the range for normal users (starting at
           1000).
           Exactly one of `isNormalUser` and
           `isSystemUser` must be true.
@@ -677,7 +677,7 @@ in {
           {
             assertion = let
               xor = a: b: a && !b || b && !a;
-              isEffectivelySystemUser = user.isSystemUser || (user.uid != null && user.uid < 500);
+              isEffectivelySystemUser = user.isSystemUser || (user.uid != null && user.uid < 1000);
             in xor isEffectivelySystemUser user.isNormalUser;
             message = ''
               Exactly one of users.users.${user.name}.isSystemUser and users.users.${user.name}.isNormalUser must be set.
diff --git a/nixos/modules/services/x11/display-managers/lightdm.nix b/nixos/modules/services/x11/display-managers/lightdm.nix
index f74e8efb8f64..65f414705fc5 100644
--- a/nixos/modules/services/x11/display-managers/lightdm.nix
+++ b/nixos/modules/services/x11/display-managers/lightdm.nix
@@ -32,7 +32,7 @@ let
   usersConf = writeText "users.conf"
     ''
       [UserList]
-      minimum-uid=500
+      minimum-uid=1000
       hidden-users=${concatStringsSep " " dmcfg.hiddenUsers}
       hidden-shells=/run/current-system/sw/bin/nologin
     '';