diff --git a/pkgs/development/python-modules/karton-yaramatcher/default.nix b/pkgs/development/python-modules/karton-yaramatcher/default.nix
index 592cb5f855a6..f85c756b811e 100644
--- a/pkgs/development/python-modules/karton-yaramatcher/default.nix
+++ b/pkgs/development/python-modules/karton-yaramatcher/default.nix
@@ -3,6 +3,7 @@
 , fetchFromGitHub
 , karton-core
 , unittestCheckHook
+, pythonOlder
 , yara-python
 }: