diff --git a/nix/module.nix b/nix/module.nix
index 45fb250..1428e0d 100644
--- a/nix/module.nix
+++ b/nix/module.nix
@@ -38,7 +38,7 @@ in {
 
       package = mkOption {
         type = package;
-        default = self.packages.${pkgs.system}.eris;
+        default = self.packages.${pkgs.stdenv.system}.eris;
         defaultText = literalExpression "pkgs.eris";
         description = "The Eris package to use.";
       };