diff --git a/tooz/tests/__init__.py b/tooz/tests/__init__.py
index ced7facf..0cdbf5d2 100644
--- a/tooz/tests/__init__.py
+++ b/tooz/tests/__init__.py
@@ -60,6 +60,8 @@ class TestWithCoordinator(testcase.TestCase, metaclass=SkipNotImplementedMeta):
             # defaults
             self.url = self.url.replace("etcd://", "etcd3+http://") + \
                 "?api_version=v3beta"
+        if os.getenv("TOOZ_TEST_SENTINEL"):
+            self.url = self.url.replace(":6379", ":6380?sentinel=pifpaf")
         self.useFixture(fixtures.NestedTempfile())
         self.group_id = get_random_uuid()
         self.member_id = get_random_uuid()
diff --git a/tox.ini b/tox.ini
index 9a6ab867..7eb5b2a0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,6 +23,7 @@ setenv =
     zookeeper: TOOZ_TEST_DRIVERS = zookeeper
     redis: TOOZ_TEST_DRIVERS = redis
     sentinel: TOOZ_TEST_DRIVERS = redis --sentinel
+    sentinel: TOOZ_TEST_SENTINEL = 1
     memcached: TOOZ_TEST_DRIVERS = memcached
     mysql: TOOZ_TEST_DRIVERS = mysql
     postgresql: TOOZ_TEST_DRIVERS = postgresql