diff --git a/src/coreboot/default.nix b/src/coreboot/default.nix
index 8dad1d2..85a3d05 100644
--- a/src/coreboot/default.nix
+++ b/src/coreboot/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation {
   pname = "coreboot";
   inherit version;
 
-  passthru = { inherit src; };
+  passthru = { inherit src fmap; };
   inherit src;
 
   patches = let inherit (nixpkgsOnBuildForBuild) fetchpatch; in [