diff --git a/pyexchange/connection.py b/pyexchange/connection.py
index 51feb5d..f030403 100644
--- a/pyexchange/connection.py
+++ b/pyexchange/connection.py
@@ -40,6 +40,8 @@ def build_password_manager(self):
     log.debug(u'Constructing password manager')
 
     self.password_manager = HttpNtlmAuth(self.username, self.password)
+    if self.password_manager.domain == '.':
+      self.password_manager.domain = ''
 
     return self.password_manager