diff --git a/pkgs/development/interpreters/python/hooks/default.nix b/pkgs/development/interpreters/python/hooks/default.nix
index 0a4600b9d6c3..35116b38f810 100644
--- a/pkgs/development/interpreters/python/hooks/default.nix
+++ b/pkgs/development/interpreters/python/hooks/default.nix
@@ -107,7 +107,7 @@ in {
     makePythonHook {
       name = "python-catch-conflicts-hook";
       substitutions = let
-        useLegacyHook = lib.versionOlder python.version "3.10";
+        useLegacyHook = lib.versionOlder python.pythonVersion "3.10";
       in {
         inherit pythonInterpreter pythonSitePackages;
         catchConflicts = if useLegacyHook then