diff --git a/tox_docker/tox4/config.py b/tox_docker/tox4/config.py
index 3554a97..9940c06 100644
--- a/tox_docker/tox4/config.py
+++ b/tox_docker/tox4/config.py
@@ -41,10 +41,9 @@ def register_config(self) -> None:
         )
         self.add_config(
             keys=["privileged"],
-            of_type=str,
-            default="false",
+            of_type=bool,
+            default=False,
             desc="give extended privileges to this container",
-            post_process=getboolean,
         )
         self.add_config(
             keys=["environment"],