diff --git a/tools/generate-alexa.py b/tools/generate-alexa.py
index 012b62b..46c5fca 100644
--- a/tools/generate-alexa.py
+++ b/tools/generate-alexa.py
@@ -10,6 +10,9 @@ alexa_url = "http://s3.amazonaws.com/alexa-static/top-1m.csv.zip"
 alexa_file = "top-1m.csv.zip"
 user_agent = {"User-agent":"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0"}
 r = requests.get(alexa_url, headers=user_agent)
+with open(alexa_file, 'wb') as fd:
+    for chunk in r.iter_content(4096):
+        fd.write(chunk)
 with zipfile.ZipFile(alexa_file, 'r') as alexa_lists:
     for name in alexa_lists.namelist():
         if name == "top-1m.csv":