diff --git a/pkgs/development/python-modules/islpy/default.nix b/pkgs/development/python-modules/islpy/default.nix
index 918d8be8e9f1..d6e4332fdeaa 100644
--- a/pkgs/development/python-modules/islpy/default.nix
+++ b/pkgs/development/python-modules/islpy/default.nix
@@ -5,7 +5,6 @@
 , pybind11
 , pytestCheckHook
 , pythonOlder
-, cffi
 , six
 }: