diff --git a/lib/Alchemy/Phrasea/PhraseanetService/Controller/PSAdminController.php b/lib/Alchemy/Phrasea/PhraseanetService/Controller/PSAdminController.php
index 8093f61f0e..0c5e3e4c39 100644
--- a/lib/Alchemy/Phrasea/PhraseanetService/Controller/PSAdminController.php
+++ b/lib/Alchemy/Phrasea/PhraseanetService/Controller/PSAdminController.php
@@ -30,6 +30,15 @@ class PSAdminController extends Controller
         if ($form->isValid()) {
             $app['conf']->set(['phraseanet-service', 'expose-service'], $form->getData());
 
+            // generate a uniq key between phraseanet service and the phraseanet instance if not exist
+            if(!$app['conf']->has(['phraseanet-service', 'phraseanet_local_key'])) {
+                $instanceKey = $this->app['conf']->get(['main', 'key']);
+
+                $phraseanetLocalKey = md5($instanceKey);
+
+                $app['conf']->set(['phraseanet-service', 'phraseanet_local_key'], $phraseanetLocalKey);
+            }
+
             return $app->redirectPath('ps_admin');
         }
 
diff --git a/lib/Alchemy/Phrasea/WorkerManager/Worker/ExposeUploadWorker.php b/lib/Alchemy/Phrasea/WorkerManager/Worker/ExposeUploadWorker.php
index 71f250a535..c94f45cc39 100644
--- a/lib/Alchemy/Phrasea/WorkerManager/Worker/ExposeUploadWorker.php
+++ b/lib/Alchemy/Phrasea/WorkerManager/Worker/ExposeUploadWorker.php
@@ -126,11 +126,11 @@ class ExposeUploadWorker implements WorkerInterface
                 }
             }
 
-            $instanceKey = $this->app['conf']->get(['main', 'key']);
+            $phraseanetLocalKey = $this->app['conf']->get(['phraseanet-service', 'phraseanet_local_key']);
 
             // this is the unique reference for record in phraseanet and assets in expose
-            // instanceKey_basedID_record_id
-            $assetId = $instanceKey.'_'.$record->getId();
+            // phraseanetLocalKey_basedID_record_id
+            $assetId = $phraseanetLocalKey.'_'.$record->getId();
 
             $requestBody = [
                 'publication_id' => $payload['publicationId'],