diff --git a/synapse/storage/engines/sqlite3.py b/synapse/storage/engines/sqlite3.py
deleted file mode 100644
index 19949fc474..0000000000
--- a/synapse/storage/engines/sqlite3.py
+++ /dev/null
@@ -1,87 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2015, 2016 OpenMarket 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.
-
-import struct
-import threading
-
-from synapse.storage.prepare_database import prepare_database
-
-
-class Sqlite3Engine(object):
- single_threaded = True
-
- def __init__(self, database_module, database_config):
- self.module = database_module
-
- # The current max state_group, or None if we haven't looked
- # in the DB yet.
- self._current_state_group_id = None
- self._current_state_group_id_lock = threading.Lock()
-
- def check_database(self, txn):
- pass
-
- def convert_param_style(self, sql):
- return sql
-
- def on_new_connection(self, db_conn):
- prepare_database(db_conn, self, config=None)
- db_conn.create_function("rank", 1, _rank)
-
- def is_deadlock(self, error):
- return False
-
- def is_connection_closed(self, conn):
- return False
-
- def lock_table(self, txn, table):
- return
-
- def get_next_state_group_id(self, txn):
- """Returns an int that can be used as a new state_group ID
- """
- # We do application locking here since if we're using sqlite then
- # we are a single process synapse.
- with self._current_state_group_id_lock:
- if self._current_state_group_id is None:
- txn.execute("SELECT COALESCE(max(id), 0) FROM state_groups")
- self._current_state_group_id = txn.fetchone()[0]
-
- self._current_state_group_id += 1
- return self._current_state_group_id
-
-
-# Following functions taken from: https://github.com/coleifer/peewee
-
-def _parse_match_info(buf):
- bufsize = len(buf)
- return [struct.unpack('@I', buf[i:i + 4])[0] for i in range(0, bufsize, 4)]
-
-
-def _rank(raw_match_info):
- """Handle match_info called w/default args 'pcx' - based on the example rank
- function http://sqlite.org/fts3.html#appendix_a
- """
- match_info = _parse_match_info(raw_match_info)
- score = 0.0
- p, c = match_info[:2]
- for phrase_num in range(p):
- phrase_info_idx = 2 + (phrase_num * c * 3)
- for col_num in range(c):
- col_idx = phrase_info_idx + (col_num * 3)
- x1, x2 = match_info[col_idx:col_idx + 2]
- if x1 > 0:
- score += float(x1) / x2
- return score
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