diff --git a/addons/auth_signup/res_users.py b/addons/auth_signup/res_users.py
index b896e92558d..e393af29ba9 100644
--- a/addons/auth_signup/res_users.py
+++ b/addons/auth_signup/res_users.py
@@ -279,3 +279,9 @@ class res_users(osv.Model):
             ctx = dict(context, create_user=True)
             self.action_reset_password(cr, uid, [user.id], context=ctx)
         return user_id
+
+    def copy(self, cr, uid, id, default=None, context=None):
+        if not default or not default.get('email'):
+            # avoid sending email to the user we are duplicating
+            context = dict(context or {}, reset_password=False)
+        return super(res_users, self).copy(cr, uid, id, default=default, context=context)