diff --git a/src/nix/evaluator/nix_eval_jobs.rs b/src/nix/evaluator/nix_eval_jobs.rs
index 98f5ac4..1aab4d5 100644
--- a/src/nix/evaluator/nix_eval_jobs.rs
+++ b/src/nix/evaluator/nix_eval_jobs.rs
@@ -86,7 +86,6 @@ impl DrvSetEvaluator for NixEvalJobs {
 
         let mut command = Command::new(&self.executable);
         command
-            .arg("--impure")
             .arg("--workers")
             .arg(self.workers.to_string())
             .arg(&expr_file);