diff --git a/pkgs/development/python-modules/pysimplesoap/default.nix b/pkgs/development/python-modules/pysimplesoap/default.nix
index 80eb5b62070d..db5c14113c7f 100644
--- a/pkgs/development/python-modules/pysimplesoap/default.nix
+++ b/pkgs/development/python-modules/pysimplesoap/default.nix
@@ -4,22 +4,25 @@
   fetchPypi,
   buildPythonPackage,
   m2crypto,
+  setuptools,
   nix-update-script,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "pysimplesoap";
   version = "1.16.2";
-  format = "setuptools";
+  pyproject = true;
 
   passthru.updateScript = nix-update-script { };
 
   src = fetchPypi {
     pname = "PySimpleSOAP";
-    inherit version;
+    inherit (finalAttrs) version;
     hash = "sha256-sbv00NCt/5tlIZfWGqG3ZzGtYYhJ4n0o/lyyUJFtZ+E=";
   };
 
+  build-system = [ setuptools ];
+
   propagatedBuildInputs = [ m2crypto ];
 
   # Patches necessary for Python 3 compatibility plus bugfixes
@@ -29,7 +32,7 @@ buildPythonPackage rec {
         args:
         fetchDebianPatch (
           {
-            inherit pname version;
+            inherit (finalAttrs) pname version;
             debianRevision = "5";
           }
           // args
@@ -71,4 +74,4 @@ buildPythonPackage rec {
     #  so co-maintainers would be welcome.
     maintainers = [ lib.maintainers.nicoo ];
   };
-}
+})