diff --git a/lib/objectid.js b/lib/objectid.js
index 46aff6444..918ff3dbc 100644
--- a/lib/objectid.js
+++ b/lib/objectid.js
@@ -224,7 +224,7 @@ class ObjectId {
    */
   equals(otherId) {
     if (otherId instanceof ObjectId) {
-      return this.toString() === otherId.toString();
+      return this.id[11] === otherId.id[11] && this.id.equals(otherId.id);
     }
 
     if (