diff --git a/src/structures/APIMessage.js b/src/structures/APIMessage.js
index ebe82282..d475df72 100644
--- a/src/structures/APIMessage.js
+++ b/src/structures/APIMessage.js
@@ -171,6 +171,7 @@ class APIMessage {
         : this.options.allowedMentions;
 
     if (allowedMentions) {
+      allowedMentions = Util.cloneObject(allowedMentions);
       allowedMentions.replied_user = allowedMentions.repliedUser;
       delete allowedMentions.repliedUser;
     }