diff --git a/tidepool/src/builders/foundation/basic.nix b/tidepool/src/builders/foundation/basic.nix
index 6738aff..7e769db 100644
--- a/tidepool/src/builders/foundation/basic.nix
+++ b/tidepool/src/builders/foundation/basic.nix
@@ -71,7 +71,7 @@ in
               (lib.packages.build packages.foundation.bash.versions."5.2.15-stage1" "x86_64-linux" system).package
             }/bin/bash";
 
-        built = builtins.derivation ({
+        built = builtins.derivation (package.vars // {
           inherit (package) name env;
           inherit script system;