diff --git a/pkgs/development/python-modules/mdformat-simple-breaks/default.nix b/pkgs/development/python-modules/mdformat-simple-breaks/default.nix
index b4d293f6368f..c5bbeeb46de9 100644
--- a/pkgs/development/python-modules/mdformat-simple-breaks/default.nix
+++ b/pkgs/development/python-modules/mdformat-simple-breaks/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
+, flit-core
 , mdformat
 , mdit-py-plugins
 , pythonOlder
@@ -9,7 +10,7 @@
 buildPythonPackage rec {
   pname = "mdformat-simple-breaks";
   version = "0.0.1";
-  format = "flit";
+  format = "pyproject";
 
   disabled = pythonOlder "3.7";
 
@@ -20,6 +21,10 @@ buildPythonPackage rec {
     hash = "sha256-4lJHB4r9lI2uGJ/BmFFc92sumTRKBBwiRmGBdQkzfd0=";
   };
 
+  nativeBuildInputs = [
+    flit-core
+  ];
+
   buildInputs = [
     mdformat
   ];