diff --git a/nixos/lib/test-driver/src/test_driver/__init__.py b/nixos/lib/test-driver/src/test_driver/__init__.py
index 62c2a6073e6c..3e0588bf7bce 100644
--- a/nixos/lib/test-driver/src/test_driver/__init__.py
+++ b/nixos/lib/test-driver/src/test_driver/__init__.py
@@ -88,6 +88,11 @@ def main() -> None:
         type=Path,
         required=True,
     )
+    arg_parser.add_argument(
+        "--test-script",
+        help="path to a test script to run, taking precedence over the one defined in the config file",
+        type=Path,
+    )
     arg_parser.add_argument(
         "--keep-vm-state",
         help=argparse.SUPPRESS,
@@ -162,8 +167,12 @@ def main() -> None:
     if args.debug_hook_attach is not None:
         debugger = Debug(logger, args.debug_hook_attach)
 
+    config = load_driver_configuration(args.config)
+    if args.test_script is not None:
+        config.test_script = args.test_script
+
     with Driver(
-        config=load_driver_configuration(args.config),
+        config=config,
         out_dir=output_directory,
         logger=logger,
         keep_machine_state=args.keep_machine_state,