diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 2120f46ed..23b4a8d76 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -268,31 +268,6 @@ class DataStore(RoomMemberStore, RoomStore,
 
         return self.runInteraction("count_users", _count_users)
 
-    def count_monthly_users(self):
-        """Counts the number of users who used this homeserver in the last 30 days
-
-        This method should be refactored with count_daily_users - the only
-        reason not to is waiting on definition of mau
-
-        Returns:
-            Defered[int]
-        """
-        def _count_monthly_users(txn):
-            thirty_days_ago = int(self._clock.time_msec()) - (1000 * 60 * 60 * 24 * 30)
-            sql = """
-                SELECT COALESCE(count(*), 0) FROM (
-                    SELECT user_id FROM user_ips
-                    WHERE last_seen > ?
-                    GROUP BY user_id
-                ) u
-            """
-
-            txn.execute(sql, (thirty_days_ago,))
-            count, = txn.fetchone()
-            return count
-
-        return self.runInteraction("count_monthly_users", _count_monthly_users)
-
     def count_r30_users(self):
         """
         Counts the number of 30 day retained users, defined as:-
diff --git a/tests/storage/test__init__.py b/tests/storage/test__init__.py
deleted file mode 100644
index f19cb1265..000000000
--- a/tests/storage/test__init__.py
+++ /dev/null
@@ -1,65 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2018 New Vector Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from twisted.internet import defer
-
-import tests.utils
-
-
-class InitTestCase(tests.unittest.TestCase):
-    def __init__(self, *args, **kwargs):
-        super(InitTestCase, self).__init__(*args, **kwargs)
-        self.store = None  # type: synapse.storage.DataStore
-
-    @defer.inlineCallbacks
-    def setUp(self):
-        hs = yield tests.utils.setup_test_homeserver()
-
-        hs.config.max_mau_value = 50
-        hs.config.limit_usage_by_mau = True
-        self.store = hs.get_datastore()
-        self.clock = hs.get_clock()
-
-    @defer.inlineCallbacks
-    def test_count_monthly_users(self):
-        count = yield self.store.count_monthly_users()
-        self.assertEqual(0, count)
-
-        yield self._insert_user_ips("@user:server1")
-        yield self._insert_user_ips("@user:server2")
-
-        count = yield self.store.count_monthly_users()
-        self.assertEqual(2, count)
-
-    @defer.inlineCallbacks
-    def _insert_user_ips(self, user):
-        """
-        Helper function to populate user_ips without using batch insertion infra
-        args:
-            user (str):  specify username i.e. @user:server.com
-        """
-        yield self.store._simple_upsert(
-            table="user_ips",
-            keyvalues={
-                "user_id": user,
-                "access_token": "access_token",
-                "ip": "ip",
-                "user_agent": "user_agent",
-                "device_id": "device_id",
-            },
-            values={
-                "last_seen": self.clock.time_msec(),
-            }
-        )