diff --git a/packages/install-ses/install-ses.js b/packages/install-ses/install-ses.js
index 23928b8d057..9077ea3ddd7 100644
--- a/packages/install-ses/install-ses.js
+++ b/packages/install-ses/install-ses.js
@@ -4,7 +4,7 @@ import 'ses';
 // Install our HandledPromise global.
 import '@agoric/eventual-send/shim';
 
-lockdown({ errorTaming: 'unsafe' });
+lockdown();
 // We are now in the "Start Compartment". Our global has all the same
 // powerful things it had before, but the primordials have changed to make
 // them safe to use in the arguments of API calls we make into more limited