diff --git a/auth_user_case_insensitive/models/res_users.py b/auth_user_case_insensitive/models/res_users.py
index 501a098aa..e77f36d27 100644
--- a/auth_user_case_insensitive/models/res_users.py
+++ b/auth_user_case_insensitive/models/res_users.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # Copyright 2015-2017 LasLabs Inc.
 # License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl.html).
-
+import collections
 from odoo import api, fields, models
 
 
@@ -32,3 +32,22 @@ class ResUsers(models.Model):
         if vals.get('login'):
             vals['login'] = vals['login'].lower()
         return super(ResUsers, self).write(vals)
+
+    @api.model
+    def search(self, args, offset=0, limit=None, order=None, count=False):
+        """Modifies all search domains to replace login with login.lower()."""
+        new_args = []
+        for arg in args:
+            new_arg = arg
+            if len(arg) == 3 and arg[0] == 'login':
+                new_rvalue = arg[2]
+                if hasattr(arg[2], 'lower'):
+                    new_rvalue = arg[2].lower()
+                elif isinstance(arg[2], collections.Iterable):
+                    new_rvalue = [getattr(
+                        x, 'lower', lambda: x)() for x in arg[2]]
+                new_arg = (new_arg[0], new_arg[1], new_rvalue)
+            new_args.append(new_arg)
+        return super(ResUsers, self).search(
+            args=new_args, offset=offset, limit=limit,
+            order=order, count=count)