diff --git a/build01/nixpkgs-update.nix b/build01/nixpkgs-update.nix
index c9defbb..c7e6e2c 100644
--- a/build01/nixpkgs-update.nix
+++ b/build01/nixpkgs-update.nix
@@ -58,6 +58,7 @@ in
 
     # Since this script is long-running, put it in postStart, so
     # systemctl start nixpkgs-update runs right away
+    script = "true";
     postStart = ''
       ${nixpkgs-update-bin} delete-done --delete
       grep -rl $XDG_CACHE_HOME/nixpkgs -e buildPython | grep default | \