diff --git a/src/data-structures/queue/Queue.js b/src/data-structures/queue/Queue.js
index f6ec6d2d..64e646fc 100644
--- a/src/data-structures/queue/Queue.js
+++ b/src/data-structures/queue/Queue.js
@@ -21,7 +21,7 @@ export default class Queue {
    * @return {*}
    */
   peek() {
-    if (!this.linkedList.head) {
+    if (this.isEmpty()) {
       return null;
     }