diff --git a/overlays/nixpkgs/unstable.nix b/overlays/nixpkgs/unstable.nix
index 929416e..b8ed692 100644
--- a/overlays/nixpkgs/unstable.nix
+++ b/overlays/nixpkgs/unstable.nix
@@ -1,5 +1,6 @@
 { inputs, ... }: final: prev: {
-  unstable = inputs.nixpkgs-unstable {
-    inherit (prev) system config overlays;
-  };
+  unstable = (inputs.nixpkgs-unstable.legacyPackages.${prev.system}).extend
+    (self: super: {
+      inherit (prev) config system overlays;
+    });
 }