diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index a11653a..34f082a 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,14 @@
 Changelog
 =========
 
+`1.8.1`_ - 2021-08-27
+---------------------
+
+**Features**
+
+* Fix broken ``BLOCK_GUEST_USERS`` setting. @JonasKs #180
+
+
 `1.8.0`_ - 2021-08-14
 ---------------------
 
@@ -253,6 +261,7 @@ Changelog
 
 * Initial release
 
+.. _1.8.1: https://github.com/snok/django-auth-adfs/compare/1.8.0...1.8.1
 .. _1.8.0: https://github.com/snok/django-auth-adfs/compare/1.7.0...1.8.0
 .. _1.7.0: https://github.com/snok/django-auth-adfs/compare/1.6.1...1.7.0
 .. _1.6.1: https://github.com/snok/django-auth-adfs/compare/1.6.0...1.6.1
diff --git a/django_auth_adfs/__init__.py b/django_auth_adfs/__init__.py
index 9320862..549c3a4 100644
--- a/django_auth_adfs/__init__.py
+++ b/django_auth_adfs/__init__.py
@@ -4,4 +4,4 @@
 Adding imports here will break setup.py
 """
 
-__version__ = '1.8.0'
+__version__ = '1.8.1'
diff --git a/django_auth_adfs/backend.py b/django_auth_adfs/backend.py
index 98093f5..d5ff8db 100644
--- a/django_auth_adfs/backend.py
+++ b/django_auth_adfs/backend.py
@@ -92,7 +92,7 @@ def process_access_token(self, access_token, adfs_response=None):
         claims = self.validate_access_token(access_token)
         if (
             settings.BLOCK_GUEST_USERS
-            and claims.get('http://schemas.microsoft.com/identity/claims/tenantid')
+            and claims.get('tid')
             != settings.TENANT_ID
         ):
             logger.info('Guest user denied')
diff --git a/pyproject.toml b/pyproject.toml
index 1ecdc9e..4c31249 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = 'django-auth-adfs'
-version = '1.8.0'  # Remember to also change __init__.py version
+version = '1.8.1'  # Remember to also change __init__.py version
 description = 'A Django authentication backend for Microsoft ADFS and AzureAD'
 authors = ['Joris Beckers <joris.beckers@gmail.com>']
 maintainers = ['Jonas Krüger Svensson <jonas-ks@hotmail.com>', 'Sondre Lillebø Gundersen <sondrelg@live.no>']
diff --git a/tests/utils.py b/tests/utils.py
index 78d5b25..5cee25e 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -112,7 +112,7 @@ def do_build_access_token(request, issuer, schema=None):
         "ver": "1.0"
     }
     if schema:
-        claims['http://schemas.microsoft.com/identity/claims/tenantid'] = schema
+        claims['tid'] = schema
     if issuer.startswith('https://sts.windows.net'):
         claims['upn'] = 'testuser'
         claims['groups'] = claims['group']