diff --git a/lib/utils/tar.js b/lib/utils/tar.js
index 31f8bb089ed85..63ef6067acb90 100644
--- a/lib/utils/tar.js
+++ b/lib/utils/tar.js
@@ -59,7 +59,7 @@ const getContents = async (manifest, tarball) => {
       totalEntries++
       totalEntrySize += entry.size
       const p = entry.path
-      if (p.startsWith('package/node_modules/')) {
+      if (p.startsWith('package/node_modules/') && p !== 'package/node_modules/') {
         const name = p.match(/^package\/node_modules\/((?:@[^/]+\/)?[^/]+)/)[1]
         bundled.add(name)
       }
@@ -72,7 +72,7 @@ const getContents = async (manifest, tarball) => {
   })
   stream.end(tarball)
 
-  const integrity = await ssri.fromData(tarball, {
+  const integrity = ssri.fromData(tarball, {
     algorithms: ['sha1', 'sha512'],
   })
 
diff --git a/test/lib/utils/tar.js b/test/lib/utils/tar.js
index 45ba720ac54ed..a0a37a3356eea 100644
--- a/test/lib/utils/tar.js
+++ b/test/lib/utils/tar.js
@@ -1,6 +1,8 @@
 const t = require('tap')
+const tar = require('tar')
 const pack = require('libnpmpack')
 const ssri = require('ssri')
+const { readFile } = require('fs/promises')
 const tmock = require('../../fixtures/tmock')
 const { cleanZlib } = require('../../fixtures/clean-snapshot')
 
@@ -106,7 +108,7 @@ t.test('should log tarball contents with unicode', async (t) => {
   t.end()
 })
 
-t.test('should getContents of a tarball', async (t) => {
+t.test('should getContents of a tarball with only a package.json', async (t) => {
   const testDir = t.testdir({
     'package.json': JSON.stringify({
       name: 'my-cool-pkg',
@@ -142,3 +144,82 @@ t.test('should getContents of a tarball', async (t) => {
   }, 'contents are correct')
   t.end()
 })
+
+t.test('should getContents of a tarball with a node_modules directory included', async (t) => {
+  const testDir = t.testdir({
+    package: {
+      'package.json': JSON.stringify({
+        name: 'my-cool-pkg',
+        version: '1.0.0',
+      }, null, 2),
+      node_modules: {
+        'bundle-dep': {
+          'package.json': JSON.stringify({
+            name: 'bundle-dep',
+            version: '1.0.0',
+          }, null, 2),
+        },
+      },
+    },
+  })
+
+  await tar.c({
+    gzip: true,
+    file: 'npm-example-v1.tgz',
+    C: testDir,
+  }, ['package'])
+
+  const tarball = await readFile(`npm-example-v1.tgz`)
+
+  const tarballContents = await getContents({
+    name: 'my-cool-pkg',
+    version: '1.0.0',
+  }, tarball)
+
+  const integrity = ssri.fromData(tarball, {
+    algorithms: ['sha1', 'sha512'],
+  })
+
+  // zlib is nondeterministic
+  t.match(tarballContents.shasum, /^[0-9a-f]{40}$/)
+  delete tarballContents.shasum
+
+  // assert mode differently according to platform
+  if (process.platform === 'win32') {
+    tarballContents.files[0].mode = 511
+    tarballContents.files[1].mode = 511
+    tarballContents.files[2].mode = 511
+    tarballContents.files[3].mode = 438
+    tarballContents.files[4].mode = 438
+  } else {
+    tarballContents.files[0].mode = 493
+    tarballContents.files[1].mode = 493
+    tarballContents.files[2].mode = 493
+    tarballContents.files[3].mode = 420
+    tarballContents.files[4].mode = 420
+  }
+
+  tarballContents.files.forEach((file) => {
+    delete file.mode
+  })
+
+  t.same(tarballContents, {
+    id: 'my-cool-pkg@1.0.0',
+    name: 'my-cool-pkg',
+    version: '1.0.0',
+    size: tarball.length,
+    unpackedSize: 97,
+    integrity: ssri.parse(integrity.sha512[0]),
+    filename: 'my-cool-pkg-1.0.0.tgz',
+    files: [
+      { path: '', size: 0 },
+      { path: 'node_modules/', size: 0 },
+      { path: 'node_modules/bundle-dep/', size: 0 },
+      { path: 'node_modules/bundle-dep/package.json', size: 48 },
+      { path: 'package.json', size: 49 },
+    ],
+    entryCount: 5,
+    bundled: ['bundle-dep'],
+  }, 'contents are correct')
+  t.end()
+})