diff --git a/valhallaAPI/valhalla.py b/valhallaAPI/valhalla.py
index 5e6b334..602d915 100644
--- a/valhallaAPI/valhalla.py
+++ b/valhallaAPI/valhalla.py
@@ -79,7 +79,7 @@ def set_proxy(self, proxy, user="", pwd=""):
         # Auth
         auth_string = ""
         if user:
-            auth_string = "{1}:{2}@".format(user, pwd)
+            auth_string = "{0}:{1}@".format(user, pwd)
         # Set the proxy
         self.proxies = {u.scheme: '{0}://{1}{2}/'.format(
             u.scheme,