diff --git a/pkgs/development/python-modules/rfcat/default.nix b/pkgs/development/python-modules/rfcat/default.nix
index 0b9149a61b82..0828287ff84a 100644
--- a/pkgs/development/python-modules/rfcat/default.nix
+++ b/pkgs/development/python-modules/rfcat/default.nix
@@ -8,6 +8,7 @@
 , pyusb
 , hostPlatform
 , pytestCheckHook
+, pythonOlder
 }:
 
 buildPythonPackage rec {