diff --git a/packages/xsnap/src/avaHandler.js b/packages/xsnap/src/avaHandler.js
index 172d388c146..f8b0d1b58a5 100644
--- a/packages/xsnap/src/avaHandler.js
+++ b/packages/xsnap/src/avaHandler.js
@@ -56,6 +56,7 @@ const testRequire = function require(specifier) {
       return { wrapTest: test => test };
     case '@endo/init':
     case '@endo/init/debug.js':
+    case '@endo/init/pre.js':
       return undefined;
     case '@agoric/install-metering-and-ses':
       console.log('TODO: @agoric/install-metering-and-ses');
diff --git a/packages/xsnap/src/avaXS.js b/packages/xsnap/src/avaXS.js
index 7c0677325ac..870e29f6c70 100644
--- a/packages/xsnap/src/avaXS.js
+++ b/packages/xsnap/src/avaXS.js
@@ -35,6 +35,7 @@ const externals = [
   '@endo/bundle-source',
   '@endo/init',
   '@endo/init/debug.js',
+  '@endo/init/pre.js',
   '@agoric/install-metering-and-ses',
 ];