diff --git a/artiq-zynq.nix b/artiq-zynq.nix
index 6b7854f..0dc08e5 100644
--- a/artiq-zynq.nix
+++ b/artiq-zynq.nix
@@ -1,5 +1,5 @@
 let
-  pkgs = import <nixpkgs> {};
+  pkgs = import <nixpkgs> { overlays = [ (import ./artiq-fast/mozilla-overlay.nix) ]; };
   artiq-zynq = import <artiq-zynq>;
   artiq-fast = import <artiq-fast> { inherit pkgs; };