diff --git a/overlay.nix b/overlay.nix
index 821cd33..f1536bf 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -73,7 +73,7 @@ let
           inputs = prev.${name}.buildInputs ++ prev.${name}.nativeBuildInputs;
           nixDependency = lib.findFirst
             (drv: (drv.pname or "") == "nix")
-            prev.nixVersions.stable_upstream # default to stable nix if nix is not an input
+            final.nixVersions.stable_upstream # default to stable nix if nix is not an input
             inputs;
           nixMajor = lib.versions.major (nixDependency.version or "");
           nixMinor = lib.versions.minor (nixDependency.version or "");