diff --git a/zulip/integrations/codebase/zulip_codebase_mirror b/zulip/integrations/codebase/zulip_codebase_mirror
index 66f8e23..5e8d46d 100755
--- a/zulip/integrations/codebase/zulip_codebase_mirror
+++ b/zulip/integrations/codebase/zulip_codebase_mirror
@@ -63,7 +63,7 @@ def make_api_call(path):
                                        "Content-Type": "application/json",
                                        "Accept": "application/json"})
     if response.status_code == 200:
-        return json.loads(response.text)
+        return json.loads(response.text)  # type: ignore  # dynamic import
 
     if response.status_code >= 500:
         logging.error(str(response.status_code))
diff --git a/zulip/integrations/jabber/jabber_mirror_backend.py b/zulip/integrations/jabber/jabber_mirror_backend.py
index 8442092..3b0b153 100755
--- a/zulip/integrations/jabber/jabber_mirror_backend.py
+++ b/zulip/integrations/jabber/jabber_mirror_backend.py
@@ -37,7 +37,7 @@
 #               | other sender|  x  |    |        |
 # public mode   +-------------+-----+----+--------+----
 #               | self sender |     |    |        |
-from typing import Dict, List, Set
+from typing import Dict, List, Set, Optional
 
 import logging
 import threading
@@ -216,7 +216,7 @@ class ZulipToJabberBot(object):
     def __init__(self, zulip_client):
         # type: (Client) -> None
         self.client = zulip_client
-        self.jabber = None
+        self.jabber = None  # type: Optional[JabberToZulipBot]
 
     def set_jabber_client(self, client):
         # type: (JabberToZulipBot) -> None
diff --git a/zulip/integrations/zephyr/zephyr_mirror_backend.py b/zulip/integrations/zephyr/zephyr_mirror_backend.py
index bb2e382..ded3422 100755
--- a/zulip/integrations/zephyr/zephyr_mirror_backend.py
+++ b/zulip/integrations/zephyr/zephyr_mirror_backend.py
@@ -341,7 +341,7 @@ def decrypt_zephyr(zephyr_class, instance, body):
     return decrypted
 
 def process_notice(notice, log):
-    # type: (zulip, Optional[IO[Any]]) -> None
+    # type: (Any, Optional[IO[Any]]) -> None
     (zsig, body) = parse_zephyr_body(notice.message, notice.format)
     is_personal = False
     is_huddle = False