diff --git a/files/__main__.py b/files/__main__.py
index d2991b28c..ea9c3ee93 100644
--- a/files/__main__.py
+++ b/files/__main__.py
@@ -255,7 +255,7 @@ def after_request(response):
 		abort(500)
 
 	response.headers.remove("Cache-Control")
-	response.headers.add("Cache-Control", "public, maxage=600")
+	response.headers.add("Cache-Control", "public, max-age=600")
 
 	return response