diff --git a/hc/api/decorators.py b/hc/api/decorators.py
index b686f349..8ee64f6a 100644
--- a/hc/api/decorators.py
+++ b/hc/api/decorators.py
@@ -109,6 +109,7 @@ def cors(*methods):
             response["Access-Control-Allow-Origin"] = "*"
             response["Access-Control-Allow-Headers"] = "X-Api-Key"
             response["Access-Control-Allow-Methods"] = methods_str
+            response["Access-Control-Max-Age"] = "600"
             return response
 
         return wrapper