diff --git a/src/nix/hive/mod.rs b/src/nix/hive/mod.rs
index e82e699..3afb9e5 100644
--- a/src/nix/hive/mod.rs
+++ b/src/nix/hive/mod.rs
@@ -374,7 +374,8 @@ impl<'hive> NixInstantiate<'hive> {
 
     fn eval(self) -> Command {
         let mut command = self.instantiate();
-        command.arg("--eval").arg("--json");
+        command.arg("--eval").arg("--json")
+            .arg("--read-write-mode"); // For cases involving IFD
         command
     }