diff --git a/krebs/3modules/fetchWallpaper.nix b/krebs/3modules/fetchWallpaper.nix
index 5a5065565..e89b86e32 100644
--- a/krebs/3modules/fetchWallpaper.nix
+++ b/krebs/3modules/fetchWallpaper.nix
@@ -53,7 +53,7 @@ let
   imp = {
     users.users.fetchWallpaper = {
       name = "fetchWallpaper";
-      uid = genid "fetchWallpaper";
+      uid = genid_uint31 "fetchWallpaper";
       description = "fetchWallpaper user";
       home = cfg.stateDir;
       createHome = true;