diff --git a/reference/mongo/mongoexception.xml b/reference/mongo/mongoexception.xml
index 94ba490948..de112ff698 100644
--- a/reference/mongo/mongoexception.xml
+++ b/reference/mongo/mongoexception.xml
@@ -144,7 +144,7 @@
       <literal>invalid regex</literal>
      </para>
      <para>
-      Code: 8
+      Code: 9
      </para>
      <para>
       The regex passed to <classname>MongoRegex</classname> is not of the