diff --git a/synapse/events/spamcheck.py b/synapse/events/spamcheck.py
index bad18f7fdf..936896656a 100644
--- a/synapse/events/spamcheck.py
+++ b/synapse/events/spamcheck.py
@@ -15,13 +15,12 @@
# limitations under the License.
import inspect
-from typing import Any, Dict, List, Optional, Tuple
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple
from synapse.spam_checker_api import RegistrationBehaviour
from synapse.types import Collection
-MYPY = False
-if MYPY:
+if TYPE_CHECKING:
import synapse.events
import synapse.server
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 8e014c9bb5..22d1e9d35c 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -25,7 +25,7 @@ The methods that define policy are:
import abc
import logging
from contextlib import contextmanager
-from typing import Dict, Iterable, List, Set, Tuple
+from typing import TYPE_CHECKING, Dict, Iterable, List, Set, Tuple
from prometheus_client import Counter
from typing_extensions import ContextManager
@@ -46,8 +46,7 @@ from synapse.util.caches.descriptors import cached
from synapse.util.metrics import Measure
from synapse.util.wheel_timer import WheelTimer
-MYPY = False
-if MYPY:
+if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 25d3cc6148..93c06afe27 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -18,7 +18,7 @@
import logging
import re
-from typing import List, Optional
+from typing import TYPE_CHECKING, List, Optional
from urllib import parse as urlparse
from synapse.api.constants import EventTypes, Membership
@@ -48,8 +48,7 @@ from synapse.types import RoomAlias, RoomID, StreamToken, ThirdPartyInstanceID,
from synapse.util import json_decoder
from synapse.util.stringutils import random_string
-MYPY = False
-if MYPY:
+if TYPE_CHECKING:
import synapse.server
logger = logging.getLogger(__name__)
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