diff --git a/scrapy/tests/test_crawl.py b/scrapy/tests/test_crawl.py
index 10219a602..1878f7a1d 100644
--- a/scrapy/tests/test_crawl.py
+++ b/scrapy/tests/test_crawl.py
@@ -112,7 +112,7 @@ Connection: close
 foo body
 with multiples lines
 '''})
-        spider = SimpleSpider("http://localhost:8998/raw?{}".format(query))
+        spider = SimpleSpider("http://localhost:8998/raw?{0}".format(query))
         yield docrawl(spider)
         log = get_testlog()
         self.assertEqual(log.count("Got response 200"), 1)