diff --git a/src/Bundle/ChillWopiBundle/src/Service/Wopi/ChillDocumentManager.php b/src/Bundle/ChillWopiBundle/src/Service/Wopi/ChillDocumentManager.php
index 62362d48f..ac3de1729 100644
--- a/src/Bundle/ChillWopiBundle/src/Service/Wopi/ChillDocumentManager.php
+++ b/src/Bundle/ChillWopiBundle/src/Service/Wopi/ChillDocumentManager.php
@@ -190,7 +190,7 @@ final class ChillDocumentManager implements DocumentManagerInterface
     }
 
     public function getSize(Document $document): int {
-        return strlen($this->getContent());
+        return strlen($this->getContent($document));
     }
 
     public function read(Document $document): StreamInterface {