diff --git a/loopback/server/middleware.json b/loopback/server/middleware.json
index 7fbd27250..60bedcdb3 100644
--- a/loopback/server/middleware.json
+++ b/loopback/server/middleware.json
@@ -11,7 +11,7 @@
     "helmet#hsts": {
       "params": {
         "maxAge": 0,
-        "includeSubdomains": true
+        "includeSubDomains": true
       }
     },
     "helmet#hidePoweredBy": {},