diff --git a/respodns/top1m.py b/respodns/top1m.py
index a1118b7..c68c8e2 100644
--- a/respodns/top1m.py
+++ b/respodns/top1m.py
@@ -26,6 +26,7 @@ def download_top1m(urltop=None, csvfn=None):
     with urlopen(urltop) as re:
         comp.write(re.read())
 
+    comp.seek(0)
     with ZipFile(comp) as zipf:
         with zipf.open(csvfn) as f:
             uncomp = f.read()