diff --git a/src/infrastructure/celerity/CelerityResourceController.php b/src/infrastructure/celerity/CelerityResourceController.php
index 7e8ccc299d..4d8d7f6cea 100644
--- a/src/infrastructure/celerity/CelerityResourceController.php
+++ b/src/infrastructure/celerity/CelerityResourceController.php
@@ -90,7 +90,7 @@ abstract class CelerityResourceController extends PhabricatorController {
       'js'  => 'text/javascript; charset=utf-8',
       'png' => 'image/png',
       'gif' => 'image/gif',
-      'jpg' => 'image/jpg',
+      'jpg' => 'image/jpeg',
       'swf' => 'application/x-shockwave-flash',
       'woff' => 'font/woff',
     );