diff --git a/packages/discord.js/src/managers/GuildMemberManager.js b/packages/discord.js/src/managers/GuildMemberManager.js
index 703acf586522..6a4739f14777 100644
--- a/packages/discord.js/src/managers/GuildMemberManager.js
+++ b/packages/discord.js/src/managers/GuildMemberManager.js
@@ -1,6 +1,5 @@
 'use strict';
 
-const { Buffer } = require('node:buffer');
 const { setTimeout, clearTimeout } = require('node:timers');
 const { Collection } = require('@discordjs/collection');
 const { makeURLSearchParams } = require('@discordjs/rest');
@@ -128,8 +127,12 @@ class GuildMemberManager extends CachedManager {
       resolvedOptions.roles = resolvedRoles;
     }
     const data = await this.client.rest.put(Routes.guildMember(this.guild.id, userId), { body: resolvedOptions });
-    // Data is an empty buffer if the member is already part of the guild.
-    return data instanceof Buffer ? (options.fetchWhenExisting === false ? null : this.fetch(userId)) : this._add(data);
+    // Data is an empty Uint8Array if the member is already part of the guild.
+    return data instanceof Uint8Array
+      ? options.fetchWhenExisting === false
+        ? null
+        : this.fetch(userId)
+      : this._add(data);
   }
 
   /**