diff --git a/nixos/modules/config/users-groups.nix b/nixos/modules/config/users-groups.nix
index a34d28143418..19efad4b9ce6 100644
--- a/nixos/modules/config/users-groups.nix
+++ b/nixos/modules/config/users-groups.nix
@@ -96,7 +96,7 @@ let
           only has an effect if <option>uid</option> is
           <option>null</option>, 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 <literal>isNormalUser</literal> and
           <literal>isSystemUser</literal> must be true.
@@ -635,7 +635,7 @@ 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.