diff --git a/packages/mongo/package.js b/packages/mongo/package.js
index 05f996fcf8..d427e89320 100644
--- a/packages/mongo/package.js
+++ b/packages/mongo/package.js
@@ -91,11 +91,11 @@ Package.onUse(function (api) {
       "polling_observe_driver.js",
       "oplog_observe_driver.js",
       "oplog_v2_converter.js",
-      "cursor_description.js",
+      "cursor_description.ts",
       "mongo_connection.js",
       "mongo_common.js",
       "asynchronous_cursor.js",
-      "cursor.js",
+      "cursor.ts",
     ],
     "server"
   );