1 files changed, 1 insertions, 1 deletions
diff --git a/lib/customisation.nix b/lib/customisation.nix
index 9017319420c8..d942f54ee798 100644
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -202,7 +202,7 @@ rec {
           callPackage = self.newScope {};
           overrideScope = g:
             makeScope newScope
-            (lib.fixed-points.extends f g);
+            (self_: let super = f self_; in super // g super self_);
           packages = f;
         };
     in self;