diff --git a/buildable.nix b/buildable.nix
index 2b61b1f7627f912a2597c1369e0cd97f7c27eac4..9445e5fa65872a350e99b29d5666509c28aad09b 100644
--- a/buildable.nix
+++ b/buildable.nix
@@ -16,8 +16,8 @@         )
       )
     );
   isReserved = n: builtins.elem n ["lib" "overlays" "modules"];
-  isBroken = p: p.meta.broken or false;
-  isFree = p: p.meta.license.free or true;
+  isBroken = p: ({ meta.broken = false; } // p).meta.broken;
+  isFree = p: ({ meta.license.free = true; } // p).meta.license.free;
 in filterSet
      (n: !(isReserved n)) # filter out non-packages
      (p: (builtins.isAttrs p)