diff --git a/pkgs/development/interpreters/python/hooks/pypa-build-hook-test.nix b/pkgs/development/interpreters/python/hooks/pypa-build-hook-test.nix
index 4153c21ca4f9..f862429d3987 100644
--- a/pkgs/development/interpreters/python/hooks/pypa-build-hook-test.nix
+++ b/pkgs/development/interpreters/python/hooks/pypa-build-hook-test.nix
@@ -10,9 +10,9 @@
     '';
     # the source of the example project
     projectSource = runCommand "my-project-source" {} ''
-      mkdir -p $out/src
+      mkdir -p $out/src/my_project
       cp ${pyprojectToml} $out/pyproject.toml
-      touch $out/src/__init__.py
+      touch $out/src/my_project/__init__.py
     '';
     in
     # this build must never triger conflicts
@@ -20,11 +20,13 @@
       pname = "dont-propagate-conflicting-deps";
       version = "0.0.0";
       src = projectSource;
-      format = "pyproject";
-      propagatedBuildInputs = [
+      pyproject = true;
+      dependencies = [
         # At least one dependency of `build` should be included here to
         # keep the test meaningful
         (mkConflict pythonOnBuildForHost.pkgs.tomli)
+      ];
+      build-system = [
         # setuptools is also needed to build the example project
         pythonOnBuildForHost.pkgs.setuptools
       ];