diff --git a/defaults/mod.yml b/defaults/mod.yml
index afa901b..869e02d 100644
--- a/defaults/mod.yml
+++ b/defaults/mod.yml
@@ -276,3 +276,7 @@ prosody_modules:
   - name: 'muc_ban_ip'
     description: 'Allows the user’s server to enforce bans by IP address'
     module_enabled: 'true'
+
+  - name: 's2s_bidi'
+    description: 'allows servers to use a single connection for sending stanzas to each other, instead of two connections'
+    module_enabled: 'true'