diff --git a/organize/member.py b/organize/member.py
index 73f3a5c..99cc5b3 100644
--- a/organize/member.py
+++ b/organize/member.py
@@ -72,7 +72,7 @@ class MemberRegistrationManager(object):
         if pfName is None:
             pfName = options(self.principalfolder_key,
                              (self.default_principalfolder,))[0]
-        self.createPrincipal(pfName, userId, password, lastName, firstName)
+        self.createPrincipal(pfName, userId, password, lastName, firstName, useExisting=useExisting)
         if len(groups)==0:
             groups = options(self.groups_key, ())
         self.setGroupsForPrincipal(pfName, userId,  groups=groups)