diff --git a/lib/Open/index.js b/lib/Open/index.js
index ab0da12..81f95d5 100644
--- a/lib/Open/index.js
+++ b/lib/Open/index.js
@@ -1,7 +1,6 @@
 const fs = require('graceful-fs');
 const directory = require('./directory');
 const Stream = require('stream');
-const { GetObjectCommand, HeadObjectCommand } = require('@aws-sdk/client-s3');
 
 module.exports = {
   buffer: function(buffer, options) {
@@ -95,6 +94,7 @@ module.exports = {
     return directory(source, options);
   },
   s3_v3: function (client, params, options) {
+    const { GetObjectCommand, HeadObjectCommand } = require('@aws-sdk/client-s3');
     const source = {
       size: async () => {
         const head = await client.send(
@@ -104,7 +104,11 @@ module.exports = {
           })
         );
 
-        return head.ContentLength ?? 0;
+        if(!head.ContentLength) {
+          return 0;
+        }
+
+        return head.ContentLength;
       },
       stream: (offset, length) => {
         const stream = Stream.PassThrough();
diff --git a/package.json b/package.json
index ab009c1..47aedc9 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
   "devDependencies": {
     "@eslint/js": "^9.2.0",
     "aws-sdk": "^2.1636.0",
+    "@aws-sdk/client-s3": "^3.0.0",
     "dirdiff": ">= 0.0.1 < 1",
     "eslint": "^9.2.0",
     "globals": "^15.2.0",
diff --git a/test/openS3_v3.js b/test/openS3_v3.js
new file mode 100644
index 0000000..6cb720b
--- /dev/null
+++ b/test/openS3_v3.js
@@ -0,0 +1,25 @@
+const test = require('tap').test;
+const fs = require('fs');
+const path = require('path');
+const unzip = require('../unzip');
+
+const version = +process.version.replace('v', '').split('.')[0];
+
+test("get content of a single file entry out of a zip", { skip: version < 16 }, function(t) {
+  const { S3Client } = require('@aws-sdk/client-s3');
+  const client = new S3Client({ region: 'us-east-1' });
+
+  return unzip.Open.s3_v3(client, { Bucket: 'unzipper', Key: 'archive.zip' })
+    .then(function(d) {
+      const file = d.files.filter(function(file) {
+        return file.path == 'file.txt';
+      })[0];
+
+      return file.buffer()
+        .then(function(str) {
+          const fileStr = fs.readFileSync(path.join(__dirname, '../testData/compressed-standard/inflated/file.txt'), 'utf8');
+          t.equal(str.toString(), fileStr);
+          t.end();
+        });
+    });
+});