diff --git a/lib/aws/AwsSigv4Signer.js b/lib/aws/AwsSigv4Signer.js
index 9a7455007..d46ba351d 100644
--- a/lib/aws/AwsSigv4Signer.js
+++ b/lib/aws/AwsSigv4Signer.js
@@ -13,6 +13,7 @@ const Connection = require('../Connection');
 const Transport = require('../Transport');
 const aws4 = require('aws4');
 const AwsSigv4SignerError = require('./errors');
+const crypto = require('crypto');
 
 const getAwsSDKCredentialsProvider = async () => {
   // First try V3
@@ -77,13 +78,12 @@ function AwsSigv4Signer(opts = {}) {
     request.region = opts.region;
     request.headers = request.headers || {};
     request.headers['host'] = request.hostname;
-    if (opts.service === 'aoss') {
-      const body = delete request.body;
-      const signed = aws4.sign(request, credentialsState.credentials);
-      signed.body = body;
-      return signed;
-    }
-    return aws4.sign(request, credentialsState.credentials);
+    const signed = aws4.sign(request, credentialsState.credentials);
+    signed.headers['x-amz-content-sha256'] = crypto
+      .createHash('sha256')
+      .update(request.body || '', 'utf8')
+      .digest('hex');
+    return signed;
   }
 
   class AwsSigv4SignerConnection extends Connection {