diff --git a/pkgs/development/python-modules/astropy-extension-helpers/default.nix b/pkgs/development/python-modules/astropy-extension-helpers/default.nix
new file mode 100644
index 000000000000..bd9dca338fcd
--- /dev/null
+++ b/pkgs/development/python-modules/astropy-extension-helpers/default.nix
@@ -0,0 +1,31 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "extension-helpers";
+  version = "0.1";
+  format = "pyproject";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "10iqjzmya2h4sk765dlm1pbqypwlqyh8rw59a5m9i63d3klnz2mc";
+  };
+
+  patches = [ ./permissions.patch ];
+
+  checkInputs = [ pytestCheckHook ];
+
+  pythonImportsCheck = [
+    "extension_helpers"
+  ];
+
+  meta = with lib; {
+    description = "Utilities for building and installing packages in the Astropy ecosystem";
+    homepage = "https://github.com/astropy/extension-helpers";
+    license = licenses.bsd3;
+    maintainers = [ maintainers.rmcgibbo ];
+  };
+}
diff --git a/pkgs/development/python-modules/astropy-extension-helpers/permissions.patch b/pkgs/development/python-modules/astropy-extension-helpers/permissions.patch
new file mode 100644
index 000000000000..cef74b336034
--- /dev/null
+++ b/pkgs/development/python-modules/astropy-extension-helpers/permissions.patch
@@ -0,0 +1,20 @@
+diff --git a/extension_helpers/_setup_helpers.py b/extension_helpers/_setup_helpers.py
+index ec3e547..e2419f7 100644
+--- a/extension_helpers/_setup_helpers.py
++++ b/extension_helpers/_setup_helpers.py
+@@ -79,8 +79,13 @@ def get_extensions(srcdir='.'):
+     if len(ext_modules) > 0:
+         main_package_dir = min(packages, key=len)
+         src_path = os.path.join(os.path.dirname(__file__), 'src')
+-        shutil.copy(os.path.join(src_path, 'compiler.c'),
+-                    os.path.join(srcdir, main_package_dir, '_compiler.c'))
++        a = os.path.join(src_path, 'compiler.c')
++        b = os.path.join(srcdir, main_package_dir, '_compiler.c')
++        try:
++            os.unlink(b)
++        except OSError:
++            pass
++        shutil.copy(a, b)
+         ext = Extension(main_package_dir + '.compiler_version',
+                         [os.path.join(main_package_dir, '_compiler.c')])
+         ext_modules.append(ext)
diff --git a/pkgs/development/python-modules/extension-helpers/default.nix b/pkgs/development/python-modules/extension-helpers/default.nix
deleted file mode 100644
index 0c23a69a89cd..000000000000
--- a/pkgs/development/python-modules/extension-helpers/default.nix
+++ /dev/null
@@ -1,41 +0,0 @@
-{ lib
-, buildPythonPackage
-, fetchPypi
-, isPy27
-, pytestCheckHook
-, setuptools_scm
-}:
-
-buildPythonPackage rec {
-  pname = "extension-helpers";
-  version = "0.1";
-  disabled = isPy27;
-
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "10iqjzmya2h4sk765dlm1pbqypwlqyh8rw59a5m9i63d3klnz2mc";
-  };
-
-  nativeBuildInputs = [
-    setuptools_scm
-  ];
-
-  propagatedBuildInputs = [
-    pytestCheckHook
-  ];
-
-  # avoid importing local module
-  preCheck = ''
-    cd extension_helpers
-  '';
-
-  # assumes setup.py is in pwd
-  disabledTests = [ "compiler_module" ];
-
-  meta = with lib; {
-    description = "Helpers to assist with building packages with compiled C/Cython extensions";
-    homepage = "https://github.com/astropy/extension-helpers";
-    license = licenses.bsd3;
-    maintainers = [ ];
-  };
-}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 33d255216962..10bb3c528573 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -421,6 +421,8 @@ in {
 
   astropy-helpers = callPackage ../development/python-modules/astropy-helpers { };
 
+  astropy-extension-helpers = callPackage ../development/python-modules/astropy-extension-helpers { };
+
   astroquery = callPackage ../development/python-modules/astroquery { };
 
   asttokens = callPackage ../development/python-modules/asttokens { };
@@ -1997,8 +1999,6 @@ in {
 
   exifread = callPackage ../development/python-modules/exifread { };
 
-  extension-helpers = callPackage ../development/python-modules/extension-helpers { };
-
   extras = callPackage ../development/python-modules/extras { };
 
   eyeD3 = callPackage ../development/python-modules/eyed3 { };