diff --git a/preload.js b/preload.js
index aca6cbabc..a547ee69a 100644
--- a/preload.js
+++ b/preload.js
@@ -183,6 +183,7 @@ window.Signal.Startup = require('./js/modules/startup');
 
 window.Signal.Types = {};
 window.Signal.Types.Attachment = Attachment;
+window.Signal.Types.Conversation = require('./ts/types/Conversation');
 window.Signal.Types.Errors = require('./js/modules/types/errors');
 
 window.Signal.Types.Message = Message;
diff --git a/test/styleguide/legacy_bridge.js b/test/styleguide/legacy_bridge.js
index 7f07ac287..5b2c58a97 100644
--- a/test/styleguide/legacy_bridge.js
+++ b/test/styleguide/legacy_bridge.js
@@ -34,6 +34,7 @@ window.Signal.Migrations.V17 = {};
 window.Signal.OS = {};
 window.Signal.Types = {};
 window.Signal.Types.Attachment = {};
+window.Signal.Types.Conversation = {};
 window.Signal.Types.Errors = {};
 window.Signal.Types.Message = {
   initializeSchemaVersion: attributes => attributes,