diff --git a/Resources/views/layout.html.twig b/Resources/views/layout.html.twig
index e8218d44c..5e170a007 100644
--- a/Resources/views/layout.html.twig
+++ b/Resources/views/layout.html.twig
@@ -564,6 +564,7 @@
                         ajaxOptions.data = formData;
                         ajaxOptions.processData = false;
                         ajaxOptions.contentType = false;
+                        delete(headers['Content-type']);
                     }
 
                     // and trigger the API call