diff --git a/src/permap.ml b/src/permap.ml
index a806edb..edf1b59 100644
--- a/src/permap.ml
+++ b/src/permap.ml
@@ -11,7 +11,8 @@ let not_logged_in redirect request =
 let asset_loader _root path _request =
   match Content.read ("assets/" ^ path) with
   | None -> Dream.empty `Not_Found
-  | Some asset -> Dream.respond asset
+  | Some asset ->
+    Dream.respond ~headers:[ ("Cache-Control", "max-age=151200") ] asset
 
 let page name request =
   match Content.read (name ^ ".md") with