diff --git a/app.yaml b/app.yaml
index 541b43b..6c08fe7 100644
--- a/app.yaml
+++ b/app.yaml
@@ -9,7 +9,11 @@ handlers:
   static_files: static/babystats.html
   upload: static/babystats.html
   secure: always
+  http_headers:
+    X-Content-Type-Options: nosniff
 
 - url: /static
   static_dir: static
   secure: always
+  http_headers:
+    X-Content-Type-Options: nosniff