diff --git a/packages/import-bundle/src/compartment-wrapper.js b/packages/import-bundle/src/compartment-wrapper.js
index b5bc57da75..3898a20e2f 100644
--- a/packages/import-bundle/src/compartment-wrapper.js
+++ b/packages/import-bundle/src/compartment-wrapper.js
@@ -42,11 +42,14 @@ export function wrapInescapableCompartment(
     // there are details to work out.
     c.globalThis.Compartment = NewCompartment;
 
-    for (const prop of Object.keys(inescapableGlobalProperties)) {
+    // Use Reflect.ownKeys, not Object.keys, because we want both
+    // string-named and symbol-named properties. Note that
+    // Reflect.ownKeys also includes non-enumerable keys.
+    for (const prop of Reflect.ownKeys(inescapableGlobalProperties)) {
       Object.defineProperty(c.globalThis, prop, {
         value: inescapableGlobalProperties[prop],
         writable: true,
-        enumerable: false,
+        enumerable: false, // TODO: really? why?
         configurable: true,
       });
     }
diff --git a/packages/import-bundle/test/compartment-wrapper.test.js b/packages/import-bundle/test/compartment-wrapper.test.js
index beca267723..af45672a91 100644
--- a/packages/import-bundle/test/compartment-wrapper.test.js
+++ b/packages/import-bundle/test/compartment-wrapper.test.js
@@ -5,6 +5,10 @@ import { wrapInescapableCompartment } from '../src/compartment-wrapper.js';
 
 const createChild = `() => new Compartment({console})`;
 
+// simulate what pass-style wants to give a liveslots environment
+const symbolEndowment = () => 0;
+const endowmentSymbol = Symbol.for('endowmentSymbol');
+
 function check(t, c, n) {
   t.is(c.evaluate('Compartment.name'), 'Compartment', `${n}.Compartment.name`);
 
@@ -21,11 +25,26 @@ function check(t, c, n) {
 
   t.is(c.evaluate('WeakMap'), 'replaced');
   t.is(c.evaluate('globalThis.WeakMap'), 'replaced');
+  t.is(c.evaluate('globalThis.unenumerable'), 'yep');
+  t.is(c.evaluate(`globalThis[Symbol.for('endowmentSymbol')]`), symbolEndowment);
 }
 
+// match what @endo/pass-style does, but note that import-bundle
+// does/should not depend upon on pass-style in any way
+//
+// alternative: have one of pass-style and import-bundle have a
+// devDependencies on the other (avoid a cycle, avoid strong/"normal"
+// `dependencies`), to allow a more thorough test, which is currently
+// only really exercised by the agoric-sdk/swingset-liveslots test
+
 test('wrap', t => {
   const inescapableTransforms = [];
-  const inescapableGlobalProperties = { WeakMap: 'replaced' };
+  const inescapableGlobalProperties = {
+    WeakMap: 'replaced',
+    [endowmentSymbol]: symbolEndowment,
+  };
+  Object.defineProperty(inescapableGlobalProperties, 'unenumerable',
+                        { value: 'yep', enumerable: false });
   const WrappedCompartment = wrapInescapableCompartment(
     Compartment,
     inescapableTransforms,