diff --git a/src/renderer.lisp b/src/renderer.lisp
index 87149f4..65e83d8 100644
--- a/src/renderer.lisp
+++ b/src/renderer.lisp
@@ -19,9 +19,9 @@
                            "private, no-store"
                            (cond 
                              ((eq strategy :static)
-                              "public, max-age=60, s-maxage=31536000")
+                              "public, max-age=31536000, immutable")
                              ((eq strategy :dynamic)
-                              "public, max-age=60 s-maxage=300, stale-while-revalidate=86400, stale-if-error=86400")
+                              "public, max-age=60 stale-while-revalidate=86400, stale-if-error=86400")
                              (t
                               "private, no-store")))))