diff --git a/@xen-orchestra/fs/src/abstract.js b/@xen-orchestra/fs/src/abstract.js
index 65058e5e0..7a3cb6778 100644
--- a/@xen-orchestra/fs/src/abstract.js
+++ b/@xen-orchestra/fs/src/abstract.js
@@ -624,14 +624,18 @@ export default class RemoteHandlerAbstract {
 
     const files = await this._list(dir)
     await asyncEach(files, file =>
-      this._unlink(`${dir}/${file}`).catch(error => {
-        // Unlink dir behavior is not consistent across platforms
-        // https://github.com/nodejs/node-v0.x-archive/issues/5791
-        if (error.code === 'EISDIR' || error.code === 'EPERM') {
-          return this._rmtree(`${dir}/${file}`)
-        }
-        throw error
-      })
+      this._unlink(`${dir}/${file}`).catch(
+        error => {
+          // Unlink dir behavior is not consistent across platforms
+          // https://github.com/nodejs/node-v0.x-archive/issues/5791
+          if (error.code === 'EISDIR' || error.code === 'EPERM') {
+            return this._rmtree(`${dir}/${file}`)
+          }
+          throw error
+        },
+       // real unlink concurrency will be 2**max directory depth 
+        { concurrency: 2 }
+      )
     )
     return this._rmtree(dir)
   }