diff --git a/src/structures/MessageAttachment.js b/src/structures/MessageAttachment.js
index 1fef93f17c2a..5c046bfb6e18 100644
--- a/src/structures/MessageAttachment.js
+++ b/src/structures/MessageAttachment.js
@@ -53,7 +53,7 @@ class MessageAttachment {
 
     if (!spoiler) {
       while (this.spoiler) {
-        this.name.slice('SPOILER_'.length);
+        this.name = this.name.slice('SPOILER_'.length);
       }
       return this;
     }