diff --git a/pkgs/development/python-modules/duckdb/default.nix b/pkgs/development/python-modules/duckdb/default.nix
index 7fcede56a5e3..787a54f26769 100644
--- a/pkgs/development/python-modules/duckdb/default.nix
+++ b/pkgs/development/python-modules/duckdb/default.nix
@@ -5,7 +5,6 @@
 , numpy
 , pandas
 , pybind11
-, mypy
 , setuptools-scm
 , pytestCheckHook
 }:
@@ -32,7 +31,6 @@ buildPythonPackage rec {
   checkInputs = [
     mypy
     pytestCheckHook
-    mypy
   ];
 
   pythonImportsCheck = [