diff --git a/lib/onlyofficeAppRequests.php b/lib/onlyofficeAppRequests.php
index de9d4f9..b4854d5 100644
--- a/lib/onlyofficeAppRequests.php
+++ b/lib/onlyofficeAppRequests.php
@@ -49,7 +49,7 @@ public function getFileUrlForConvert()
      *
      * @return array
      */
-    private static function createTempFile()
+    private function createTempFile()
     {
         $fileUrl = null;
         $fileName = 'convert.docx';