diff --git a/packages/agoric-cli/src/lib/bundles.js b/packages/agoric-cli/src/lib/bundles.js
index 04810ae0682..e41eb21ef02 100644
--- a/packages/agoric-cli/src/lib/bundles.js
+++ b/packages/agoric-cli/src/lib/bundles.js
@@ -11,7 +11,8 @@ import { ZipReader } from '@endo/zip';
 /** @import {Bundle} from '@agoric/swingset-vat'; */
 /** @import {CoreEvalPlan} from '@agoric/deploy-script-support/src/writeCoreEvalParts.js' */
 
-const PACKAGE_NAME_RE = /(?<packageName>.*-v[\d.]+(?:-n\d+)?)\//;
+// exported for testing
+export const PACKAGE_NAME_RE = /^(?:@[^/]+\/)?[^/]+/;
 
 /**
  * @typedef {{ name: string, label: string, location: string, modules: Record<string, {compartment: string, module: string}>}} Compartment
@@ -70,7 +71,7 @@ export const statBundle = async bundleFilename => {
     if (filename === 'compartment-map.json') {
       continue;
     }
-    const { packageName } = filename.match(PACKAGE_NAME_RE)?.groups ?? {};
+    const packageName = filename.match(PACKAGE_NAME_RE)?.[0];
     assert(packageName, `invalid filename ${filename}`);
     byPackage[packageName] ||= 0;
     byPackage[packageName] += size;
diff --git a/packages/agoric-cli/test/bundles-regExp.test.js b/packages/agoric-cli/test/bundles-regExp.test.js
new file mode 100644
index 00000000000..87b6f040b14
--- /dev/null
+++ b/packages/agoric-cli/test/bundles-regExp.test.js
@@ -0,0 +1,39 @@
+import test from 'ava';
+import { PACKAGE_NAME_RE } from '../src/lib/bundles.js';
+
+const goodPatterns = [
+  ['@agoric/assert-v0.6.0'],
+  ['@agoric/base-zone-v0.1.0/', '@agoric/base-zone-v0.1.0'],
+  ['@endo/base64-v1.0.5-n1/index.js', '@endo/base64-v1.0.5-n1'],
+  ['@endo/base64-v1.0.5-n1/decode.js', '@endo/base64-v1.0.5-n1'],
+  [
+    '@agoric/store-v0.9.3-dev-37ec151.0+37ec151/src/legacy/legacyWeakMap.js',
+    '@agoric/store-v0.9.3-dev-37ec151.0+37ec151',
+  ],
+  [
+    'calypso-contract-v0.1.0/src/proposals/core-proposal.js',
+    'calypso-contract-v0.1.0',
+  ],
+  ['/index.js', undefined],
+  ['/src', undefined],
+];
+
+test('simple positive', t => {
+  for (const pattern of goodPatterns) {
+    const name = pattern[0];
+    const expected = pattern.length === 2 ? pattern[1] : pattern[0];
+
+    t.is(name.match(PACKAGE_NAME_RE)?.[0], expected);
+  }
+});
+
+const badPatterns = [
+  '/user/name/sdk/node_modules/@agoric/assert-v0.6.0',
+  '/random/@agoric/base-zone-v0.1.0/',
+];
+
+test('simple negative', t => {
+  for (const pattern of badPatterns) {
+    t.falsy(pattern.match(PACKAGE_NAME_RE)?.[0], `expected ${pattern} to fail`);
+  }
+});