diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index be61147b9b..d9d0255d0b 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -18,7 +18,7 @@ import threading
import time
from six import PY2, iteritems, iterkeys, itervalues
-from six.moves import intern, range
+from six.moves import builtins, intern, range
from canonicaljson import json
from prometheus_client import Histogram
@@ -1233,7 +1233,7 @@ def db_to_json(db_content):
# psycopg2 on Python 2 returns buffer objects, which we need to cast to
# bytes to decode
- if PY2 and isinstance(db_content, buffer):
+ if PY2 and isinstance(db_content, builtins.buffer):
db_content = bytes(db_content)
# Decode it to a Unicode string before feeding it to json.loads, so we
diff --git a/synapse/storage/keys.py b/synapse/storage/keys.py
index a1331c1a61..8af17921e3 100644
--- a/synapse/storage/keys.py
+++ b/synapse/storage/keys.py
@@ -32,7 +32,7 @@ logger = logging.getLogger(__name__)
# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
# despite being deprecated and removed in favor of memoryview
if six.PY2:
- db_binary_type = buffer
+ db_binary_type = six.moves.builtins.buffer
else:
db_binary_type = memoryview
diff --git a/synapse/storage/pusher.py b/synapse/storage/pusher.py
index c7987bfcdd..2743b52bad 100644
--- a/synapse/storage/pusher.py
+++ b/synapse/storage/pusher.py
@@ -29,7 +29,7 @@ from ._base import SQLBaseStore
logger = logging.getLogger(__name__)
if six.PY2:
- db_binary_type = buffer
+ db_binary_type = six.moves.builtins.buffer
else:
db_binary_type = memoryview
diff --git a/synapse/storage/signatures.py b/synapse/storage/signatures.py
index 5623391f6e..158e9dbe7b 100644
--- a/synapse/storage/signatures.py
+++ b/synapse/storage/signatures.py
@@ -27,7 +27,7 @@ from ._base import SQLBaseStore
# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
# despite being deprecated and removed in favor of memoryview
if six.PY2:
- db_binary_type = buffer
+ db_binary_type = six.moves.builtins.buffer
else:
db_binary_type = memoryview
diff --git a/synapse/storage/transactions.py b/synapse/storage/transactions.py
index a3032cdce9..d8bf953ec0 100644
--- a/synapse/storage/transactions.py
+++ b/synapse/storage/transactions.py
@@ -30,7 +30,7 @@ from ._base import SQLBaseStore, db_to_json
# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
# despite being deprecated and removed in favor of memoryview
if six.PY2:
- db_binary_type = buffer
+ db_binary_type = six.moves.builtins.buffer
else:
db_binary_type = memoryview
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