diff --git a/src/PSS/Entities/Download.php b/src/PSS/Entities/Download.php
index b8c0751c..e1aeaf53 100644
--- a/src/PSS/Entities/Download.php
+++ b/src/PSS/Entities/Download.php
@@ -26,7 +26,7 @@ public function getStream()
      */
     public function getContentType()
     {
-        $contentType = $this->response->getHeaders()['Content-Type'];
+        $contentType = array_change_key_case($this->response->getHeaders())['content-type'];
         if ($contentType) {
             return $contentType;
         }