diff --git a/Resources/views/Export/download.html.twig b/Resources/views/Export/download.html.twig
index c517c37e8..d1f670d74 100644
--- a/Resources/views/Export/download.html.twig
+++ b/Resources/views/Export/download.html.twig
@@ -25,8 +25,7 @@
 window.addEventListener("DOMContentLoaded", function(e) {
     var url = "{{ path('chill_main_export_generate', { 'alias' : alias } ) }}",
         query = window.location.search,
-        container = document.querySelector("#download_container"),
-        header_content_type
+        container = document.querySelector("#download_container")
         ;
         
     window.fetch(url+query, { credentials: 'same-origin' })
@@ -34,14 +33,14 @@ window.addEventListener("DOMContentLoaded", function(e) {
                 if (!response.ok) {
                     throw Error(response.statusText);
                 }
-                header_content_type = response.headers.get("Content-Type");
+                
                 return response.blob();
             }).then(function(blob) {
                 var content = URL.createObjectURL(blob),
                     link = document.createElement("a"),
                     suffix_file;
                     
-                switch (header_content_type) {
+                switch (blob.type) {
                     case 'application/vnd.oasis.opendocument.spreadsheet':
                         suffix_file = '.ods';
                         break;