diff --git a/packages/base-zone/src/heap.js b/packages/base-zone/src/heap.js
index 839cd2abaf13..3445255e8d57 100644
--- a/packages/base-zone/src/heap.js
+++ b/packages/base-zone/src/heap.js
@@ -1,7 +1,7 @@
 // @ts-check
 // @jessie-check
 
-import { Far } from '@endo/far';
+import { Far, isPassable } from '@endo/pass-style';
 import { makeExo, defineExoClass, defineExoClassKit } from '@endo/exo';
 import {
   makeScalarMapStore,
@@ -12,7 +12,6 @@ import {
 
 import { makeOnceKit } from './make-once.js';
 import { agoricVatDataKeys as keys } from './keys.js';
-import { isPassable } from './is-passable.js';
 
 /**
  * @type {import('./types.js').Stores}
diff --git a/packages/base-zone/src/is-passable.js b/packages/base-zone/src/is-passable.js
deleted file mode 100644
index 258c510c6149..000000000000
--- a/packages/base-zone/src/is-passable.js
+++ /dev/null
@@ -1,23 +0,0 @@
-import { passStyleOf } from '@endo/pass-style';
-
-/**
- * Is `specimen` Passable? This returns true iff `passStyleOf(specimen)`
- * returns a string. This returns `false` iff `passStyleOf(specimen)` throws.
- * Under no normal circumstance should `isPassable(specimen)` throw.
- *
- * TODO implement an isPassable that does not rely on try/catch, and
- * move it to @endo/pass-style.
- * This implementation is just a standin until then
- *
- * @param {any} specimen
- * @returns {specimen is Passable}
- */
-export const isPassable = specimen => {
-  try {
-    // In fact, it never returns undefined. It either returns a
-    // string or throws.
-    return passStyleOf(specimen) !== undefined;
-  } catch (_) {
-    return false;
-  }
-};
diff --git a/packages/zone/src/durable.js b/packages/zone/src/durable.js
index 2d248531594f..75f632e9e00a 100644
--- a/packages/zone/src/durable.js
+++ b/packages/zone/src/durable.js
@@ -1,7 +1,7 @@
 // @ts-check
 // @jessie-check
 
-import { Far } from '@endo/far';
+import { Far, isPassable } from '@endo/pass-style';
 import {
   canBeDurable,
   makeScalarMapStore,
@@ -14,11 +14,7 @@ import {
   provideDurableWeakSetStore,
 } from '@agoric/vat-data';
 
-import {
-  agoricVatDataKeys as keys,
-  isPassable,
-  makeOnceKit,
-} from '@agoric/base-zone';
+import { agoricVatDataKeys as keys, makeOnceKit } from '@agoric/base-zone';
 
 const { Fail } = assert;
 
diff --git a/packages/zone/src/virtual.js b/packages/zone/src/virtual.js
index 95410799db0c..89a0a78a37c9 100644
--- a/packages/zone/src/virtual.js
+++ b/packages/zone/src/virtual.js
@@ -1,7 +1,7 @@
 // @ts-check
 // @jessie-check
 
-import { Far } from '@endo/far';
+import { Far, isPassable } from '@endo/pass-style';
 import {
   defineVirtualExoClass,
   defineVirtualExoClassKit,
@@ -11,11 +11,7 @@ import {
   makeScalarBigWeakSetStore,
 } from '@agoric/vat-data';
 
-import {
-  agoricVatDataKeys as keys,
-  isPassable,
-  makeOnceKit,
-} from '@agoric/base-zone';
+import { agoricVatDataKeys as keys, makeOnceKit } from '@agoric/base-zone';
 
 const emptyRecord = harden({});
 const initEmpty = harden(() => emptyRecord);