diff --git a/bin/masspay.py b/bin/masspay.py
index 1729158c0c..0f2e2d1613 100755
--- a/bin/masspay.py
+++ b/bin/masspay.py
@@ -226,7 +226,7 @@ def post_back_to_gratipay():
 
     nposts = 0
     for username, email, gross, fee, net, additional_note in csv.reader(open(GRATIPAY_CSV)):
-        url = '{}/{}/history/record-an-exchange'.format(gratipay_base_url, username)
+        url = '{}/~{}/history/record-an-exchange'.format(gratipay_base_url, username)
         note = 'PayPal MassPay to {}.'.format(email)
         if additional_note:
             note += " " + additional_note