diff --git a/public/index.php b/public/index.php
index 16a81af..f99b313 100644
--- a/public/index.php
+++ b/public/index.php
@@ -179,6 +179,7 @@ if($reqPath === '/') {
 }
 
 if(substr($reqPath, 0, 4) === '/ss/') {
+    header('Content-Type: image/jpeg');
     header('X-Accel-Redirect: /assets/no-screenshot.jpg');
     return;
 }