diff --git a/lab/test-resource-guard.nix b/lab/test-resource-guard.nix
index 13da1c8..4ece157 100644
--- a/lab/test-resource-guard.nix
+++ b/lab/test-resource-guard.nix
@@ -63,7 +63,6 @@ in
   testScript = ''
     import json
     import time
-    import os
 
     start_all()