diff --git a/pkgs/development/python-modules/threadpoolctl/default.nix b/pkgs/development/python-modules/threadpoolctl/default.nix
index bfe40429127..54d7fa12829 100644
--- a/pkgs/development/python-modules/threadpoolctl/default.nix
+++ b/pkgs/development/python-modules/threadpoolctl/default.nix
@@ -2,7 +2,7 @@
 , buildPythonPackage
 , pythonOlder
 , fetchFromGitHub
-, flit
+, flit-core
 , pytestCheckHook
 , numpy
 , scipy
@@ -13,7 +13,7 @@ buildPythonPackage rec {
   version = "3.1.0";
 
   disabled = pythonOlder "3.6";
-  format = "flit";
+  format = "pyproject";
 
   src = fetchFromGitHub {
     owner = "joblib";
@@ -22,6 +22,10 @@ buildPythonPackage rec {
     hash = "sha256-/qt7cgFbvpc1BLZC7a4S0RToqSggKXAqF1Xr6xOqzw8=";
   };
 
+  nativeBuildInputs = [
+    flit-core
+  ];
+
   nativeCheckInputs = [
     pytestCheckHook
     numpy