diff --git a/pkgs/development/python-modules/mypy/default.nix b/pkgs/development/python-modules/mypy/default.nix
index b758998c6dbc..ef6646c856b5 100644
--- a/pkgs/development/python-modules/mypy/default.nix
+++ b/pkgs/development/python-modules/mypy/default.nix
@@ -14,8 +14,10 @@
   types-setuptools,
   ast-serialize,
 
-  # propagates
+  # nativeBuildInputs + propagates
   librt,
+
+  # propagates
   mypy-extensions,
   tomli,
   typing-extensions,
@@ -51,6 +53,10 @@ buildPythonPackage rec {
     rev-prefix = "v";
   };
 
+  nativeBuildInputs = [
+    librt
+  ];
+
   build-system = [
     mypy-extensions
     pathspec