diff --git a/.ebextensions/nginx/conf.d/elasticbeanstalk/00_application.conf b/.ebextensions/nginx/conf.d/elasticbeanstalk/00_application.conf
index 822c1d3..f7f364d 100644
--- a/.ebextensions/nginx/conf.d/elasticbeanstalk/00_application.conf
+++ b/.ebextensions/nginx/conf.d/elasticbeanstalk/00_application.conf
@@ -121,6 +121,7 @@ location ^~ /api/ {
     }
     location ~ \.vtt$ {
 		 include conf.d/elasticbeanstalk/subfiles/iiif-website.conf;
+		 add_header 'Content-Type' 'text/vtt';
 		 add_header 'Access-Control-Allow-Origin' '*';
          add_header 'Cache-Control' 'public, no-transform, max-age=2419200';
          add_header "X-UA-Compatible" "IE=Edge,chrome=1";