diff --git a/lib/Structures/Message.js b/lib/Structures/Message.js
index 8d4bb743d..55a76fdb1 100644
--- a/lib/Structures/Message.js
+++ b/lib/Structures/Message.js
@@ -40,7 +40,7 @@ var Message = (function () {
 	Message.prototype.isMentioned = function isMentioned(user) {
 		user = this.client.internal.resolver.resolveUser(user);
 		if (user) {
-			return this.mentions.has(user);
+			return this.mentions.has("id", user.id);
 		} else {
 			return false;
 		}
diff --git a/src/Structures/Message.js b/src/Structures/Message.js
index 2c1e4ccd3..0f41ec5bf 100644
--- a/src/Structures/Message.js
+++ b/src/Structures/Message.js
@@ -41,7 +41,7 @@ class Message{
 	isMentioned(user){
 		user = this.client.internal.resolver.resolveUser(user);
 		if (user) {
-			return this.mentions.has(user);
+			return this.mentions.has("id", user.id);
 		} else {
 			return false;
 		}