diff --git a/pkgs/overlays/cosmic-packages.nix b/pkgs/overlays/cosmic-packages.nix
index fcaee7b..9b9f6f5 100644
--- a/pkgs/overlays/cosmic-packages.nix
+++ b/pkgs/overlays/cosmic-packages.nix
@@ -1,4 +1,7 @@
-{ inputs ? import ../../inputs.nix {}}:
+{
+  inputs ? import ../../inputs.nix {},
+  rustPlatform ? null,
+}:
 
 self: super:
 
@@ -28,5 +31,5 @@ in
 import "${nixos-cosmic}/pkgs" {
   final = self;
   prev = super;
-  rustPlatform = futureNixpkgs.rustPlatform;
+  rustPlatform = if rustPlatform != null then rustPlatform else futureNixpkgs.rustPlatform;
 }