diff --git a/pkgs/build-support/php/builders/v2/build-composer-project.nix b/pkgs/build-support/php/builders/v2/build-composer-project.nix
index b22750a75eac..f3cff848ddab 100644
--- a/pkgs/build-support/php/builders/v2/build-composer-project.nix
+++ b/pkgs/build-support/php/builders/v2/build-composer-project.nix
@@ -107,8 +107,7 @@ let
       # Projects providing a lockfile from upstream can be automatically updated.
       passthru = passthru // {
         updateScript =
-          args.passthru.updateScript
-            or (if finalAttrs.composerVendor.composerLock == null then nix-update-script { } else null);
+          args.passthru.updateScript or (if composerLock == null then nix-update-script { } else null);
       };
 
       meta = meta // {