diff --git a/source/index.txt b/source/index.txt
index 63304626fcb..adac77c8d76 100644
--- a/source/index.txt
+++ b/source/index.txt
@@ -4,7 +4,7 @@
 The MongoDB |version| Manual
 ============================
 
-.. default-domain:: mongodb
+.. default-domain:: mongodba
 
 .. admonition:: MongoDB 4.0 Released
    :class: note