diff --git a/pkgs/development/interpreters/python/python-packages-base.nix b/pkgs/development/interpreters/python/python-packages-base.nix
index 121e4ead89871..ea922745bb0d3 100644
--- a/pkgs/development/interpreters/python/python-packages-base.nix
+++ b/pkgs/development/interpreters/python/python-packages-base.nix
@@ -39,7 +39,7 @@ let
       else
         result
     )
-    // lib.optionalAttrs (f ? override) {
+    // {
       # Support overriding `f` itself, e.g. `buildPythonPackage.override { }`.
       # Ensure `makeOverridablePythonPackage` is applied to the result.
       override = lib.mirrorFunctionArgs f.override (fdrv: makeOverridablePythonPackage (f.override fdrv));