diff --git a/flake.nix b/flake.nix
index 891b5dc2..9b2aaa7d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,6 +33,7 @@
       nixosModules.nim-codex = { config, lib, pkgs, ... }: import ./nix/service.nix {
         inherit config lib pkgs;
         self = pkgs.lib.traceValFn (v: "submodules: ${toString v.submodules)}") self;
+        circomCompatPkg = circom-compat.packages.${pkgs.system}.default;
       };
 
       devShells = forAllSystems (system: let
diff --git a/nix/service.nix b/nix/service.nix
index a6ad52c5..aaa77a36 100644
--- a/nix/service.nix
+++ b/nix/service.nix
@@ -1,10 +1,10 @@
- { self, config, lib, pkgs, ... }:
+ { self, config, lib, pkgs, circomCompatPkg, ... }:
 
 let
   inherit (lib)
     types mkEnableOption mkOption mkIf literalExpression
     mdDoc;
-  
+
   toml = pkgs.formats.toml { };
 
   cfg = config.services.nim-codex;
@@ -16,7 +16,7 @@ in
 
       package = mkOption {
         type = types.package;
-        default = pkgs.callPackage ./default.nix { src = self; };
+        default = pkgs.callPackage ./default.nix { src = self; inherit circomCompatPkg; };
         defaultText = literalExpression "pkgs.codex";
         description = mdDoc "Package to use as Nim Codex node.";
       };