diff --git a/@xen-orchestra/fs/src/s3.js b/@xen-orchestra/fs/src/s3.js
index ea1b70f0342..e020a26540e 100644
--- a/@xen-orchestra/fs/src/s3.js
+++ b/@xen-orchestra/fs/src/s3.js
@@ -8,6 +8,7 @@ import { decorateWith } from '@vates/decorate-with'
 import { parse } from 'xo-remote-parser'
 
 import RemoteHandlerAbstract from './abstract'
+import { asyncEach } from '@vates/async-each'
 
 // endpoints https://docs.aws.amazon.com/general/latest/gr/s3.html
 
@@ -177,7 +178,7 @@ export default class S3Handler extends RemoteHandlerAbstract {
       Delimiter: '/', // will only return path until delimiters
     })
 
-    if (result.isTruncated) {
+    if (result.IsTruncated) {
       const error = new Error('more than 1000 objects, unsupported in this implementation')
       error.dir = dir
       throw error
@@ -267,15 +268,21 @@ export default class S3Handler extends RemoteHandlerAbstract {
         Prefix: this._dir + path + '/',
         ContinuationToken: NextContinuationToken,
       })
-      NextContinuationToken = result.isTruncated ? result.NextContinuationToken : undefined
-      for (const { Key } of result.Contents) {
+      NextContinuationToken = result.IsTruncated ? result.NextContinuationToken : undefined
+      await asyncEach(
+        result.Contents,
+        async ({Key})=>{
         // _unlink will add the prefix, but Key contains everything
         // also we don't need to check if we delete a directory, since the list only return files
-        await this._s3.deleteObject({
-          Bucket: this._bucket,
-          Key,
-        })
-      }
+          await this._s3.deleteObject({
+            Bucket: this._bucket,
+            Key,
+          })
+        },
+        {
+          concurrency: 16
+        }
+      )
     } while (NextContinuationToken !== undefined)
   }
 
diff --git a/CHANGELOG.unreleased.md b/CHANGELOG.unreleased.md
index 2d4b163f1fc..551c0d8a3ec 100644
--- a/CHANGELOG.unreleased.md
+++ b/CHANGELOG.unreleased.md
@@ -21,6 +21,8 @@
 
 - [Backup] Detect and clear orphan merge states, fix `ENOENT` errors (PR [#6087](https://github.com/vatesfr/xen-orchestra/pull/6087))
 - [Backup] Ensure merges are also executed after backup on S3, maintaining the size of the VHD chain under control [Forum#45743](https://xcp-ng.org/forum/post/45743) (PR [#6095](https://github.com/vatesfr/xen-orchestra/pull/6095))
+- [Backup] Fix merge resuming, Introduced by 5a933bad9 (PR [#6099](https://github.com/vatesfr/xen-orchestra/pull/6099))
+
 
 ### Packages to release