diff --git a/src/namespace.js b/src/namespace.js
index cb5f355d1..de9f4cdb0 100644
--- a/src/namespace.js
+++ b/src/namespace.js
@@ -62,7 +62,7 @@ Namespace.arrayToJSON = arrayToJSON;
 Namespace.isReservedId = function isReservedId(reserved, id) {
     if (reserved)
         for (var i = 0; i < reserved.length; ++i)
-            if (typeof reserved[i] !== "string" && reserved[i][0] <= id && reserved[i][1] >= id)
+            if (typeof reserved[i] !== "string" && reserved[i][0] <= id && reserved[i][1] > id)
                 return true;
     return false;
 };