diff --git a/histories/models.py b/histories/models.py
index 47abe56..401b67d 100644
--- a/histories/models.py
+++ b/histories/models.py
@@ -6,7 +6,6 @@ interests, keywords...
 from collections import namedtuple
 import random
 from math import floor
-from queue import Queue
 from xml.etree import ElementTree as ET
 from datetime import datetime
 from django.db import models
@@ -168,11 +167,11 @@ def generate_partial_history(user, t_start):
     basis = generate_first_url(user)
     result.append(PartialHistoryEntry(basis, timestamp))
     t_start += 5 * random.weibullvariate(1, 1.5)
-    queue = Queue()
-    crawler = crawl.CrawlingThread(basis, queue)
+    output_tree = []
+    crawler = crawl.CrawlingThread(basis, output_tree)
     crawler.start()
     crawler.join()
-    urls = queue.get()
+    urls = crawler.output_tree
     for url in urls:
         t_start += 5 * random.weibullvariate(1, 1.5)
         result.append(PartialHistoryEntry(url, timestamp))