diff --git a/pkgs/development/python-modules/poetry-core/default.nix b/pkgs/development/python-modules/poetry-core/default.nix
index 6f96a611168c..d5d4e36d3a37 100644
--- a/pkgs/development/python-modules/poetry-core/default.nix
+++ b/pkgs/development/python-modules/poetry-core/default.nix
@@ -35,7 +35,6 @@ buildPythonPackage rec {
   ];
 
   checkInputs = [
-    isort
     pep517
     pytest-mock
     pytestCheckHook