diff --git a/util/reserved.json b/util/reserved.json
index 66153768a9..a7ac38faf3 100644
--- a/util/reserved.json
+++ b/util/reserved.json
@@ -116,6 +116,7 @@
     "service",
     "services",
     "shop",
+    "sso",
     "staff",
     "staging",
     "static",