diff --git a/ci.nix b/ci.nix
index 30ba7a9..258a4e6 100644
--- a/ci.nix
+++ b/ci.nix
@@ -14,6 +14,7 @@ let
         environment.systemPackages = [ pkgs.git ];
       }
     '');
+    nixpkgs.symlink = toString <nixpkgs>;
   }];
 in {
   test = pkgs.krops.writeTest "test" {