diff --git a/ranked_tree.js b/ranked_tree.js
index 45b4d64..e979889 100644
--- a/ranked_tree.js
+++ b/ranked_tree.js
@@ -1,21 +1,3 @@
-class Queue {
-    constructor() {
-        this.q = [];
-    }
-
-    enqueue(x) {
-        this.q.push(x);
-    }
-
-    dequeue() {
-        return this.q.shift();
-    }
-
-    isEmpty() {
-        return this.q.length == 0;
-    }
-}
-
 class RankedTree {
     constructor() {
         this.root = null;
diff --git a/utils.js b/utils.js
index 120f869..db2c8f9 100644
--- a/utils.js
+++ b/utils.js
@@ -12,3 +12,21 @@ Array.prototype.equals = function (other) {
 
     return true;
 };
+
+class Queue {
+    constructor() {
+        this.q = [];
+    }
+
+    enqueue(x) {
+        this.q.push(x);
+    }
+
+    dequeue() {
+        return this.q.shift();
+    }
+
+    isEmpty() {
+        return this.q.length == 0;
+    }
+}