diff --git a/databox/api/src/Integration/Phrasea/Expose/ExposeClient.php b/databox/api/src/Integration/Phrasea/Expose/ExposeClient.php
index 433b4ee90..e5c592aec 100644
--- a/databox/api/src/Integration/Phrasea/Expose/ExposeClient.php
+++ b/databox/api/src/Integration/Phrasea/Expose/ExposeClient.php
@@ -255,7 +255,7 @@ public function deleteAsset(IntegrationConfig $config, IntegrationToken $integra
         ;
     }
 
-    private function putPart(string $url, mixed $handleFile, int $partSize, int $retryCount)
+    private function putPart(string $url, mixed $handleFile, int $partSize, int $retryCount): array
     {
         if ($retryCount > 0) {
             $retryCount--;
@@ -265,7 +265,7 @@ private function putPart(string $url, mixed $handleFile, int $partSize, int $ret
                 ])->getHeaders();
             } catch (\Throwable $e) {
                 if ($retryCount == 0) {
-                    throw $e; // retry unsuccess
+                    throw $e;
                 }
                 $this->putPart($url, $handleFile, $partSize, $retryCount);
             }