diff --git a/m/common/base/nix.nix b/m/common/base/nix.nix
index dc796475..5eee5b7b 100644
--- a/m/common/base/nix.nix
+++ b/m/common/base/nix.nix
@@ -23,6 +23,7 @@
       trusted-users = [ "@wheel" ];
       flake-registry = pkgs.writeText "global-registry.json"
         ''{"flakes":[],"version":2}'';
+      keep-outputs = true;
     };
 
     gc = {