diff --git a/app/models/theme.rb b/app/models/theme.rb
index 39fd7371..38343617 100644
--- a/app/models/theme.rb
+++ b/app/models/theme.rb
@@ -17,6 +17,8 @@ class Theme < ActiveRecord::Base
 
   has_attached_file :css, use_timestamp: false, s3_metadata: {
     content_type: 'text/stylesheet'
+  }, s3_headers: {
+    'Content-Type': 'text/stylesheet'
   }, fog_file: {
     content_type: 'text/stylesheet'
   }