diff --git a/zerver/lib/actions.py b/zerver/lib/actions.py
index e375efdb77..d2964554b6 100644
--- a/zerver/lib/actions.py
+++ b/zerver/lib/actions.py
@@ -1491,7 +1491,7 @@ def do_send_messages(messages_maybe_none: Sequence[Optional[MutableMapping[str,
             # messages are only associated to their subscribed users.
             if message['stream'] is None:
                 stream_id = message['message'].recipient.type_id
-                message['stream'] = Stream.objects.select_related("realm").get(id=stream_id)
+                message['stream'] = Stream.objects.select_related().get(id=stream_id)
             assert message['stream'] is not None  # assert needed because stubs for django are missing
             if message['stream'].is_public():
                 event['realm_id'] = message['stream'].realm_id
@@ -3947,8 +3947,7 @@ def do_remove_default_stream_group(realm: Realm, group: DefaultStreamGroup) -> N
 
 def get_default_streams_for_realm(realm_id: int) -> List[Stream]:
     return [default.stream for default in
-            DefaultStream.objects.select_related("stream", "stream__realm").filter(
-                realm_id=realm_id)]
+            DefaultStream.objects.select_related().filter(realm_id=realm_id)]
 
 def get_default_subs(user_profile: UserProfile) -> List[Stream]:
     # Right now default streams are realm-wide.  This wrapper gives us flexibility
diff --git a/zerver/models.py b/zerver/models.py
index d03de3d6ce..17a67e75c1 100644
--- a/zerver/models.py
+++ b/zerver/models.py
@@ -1459,7 +1459,7 @@ def get_client_remote_cache(name: str) -> Client:
 
 @cache_with_key(get_stream_cache_key, timeout=3600*24*7)
 def get_realm_stream(stream_name: str, realm_id: int) -> Stream:
-    return Stream.objects.select_related("realm").get(
+    return Stream.objects.select_related().get(
         name__iexact=stream_name.strip(), realm_id=realm_id)
 
 def stream_name_in_use(stream_name: str, realm_id: int) -> bool:
@@ -1493,14 +1493,14 @@ def bulk_get_streams(realm: Realm, stream_names: STREAM_NAMES) -> Dict[str, Any]
         #
         # This should be just
         #
-        # Stream.objects.select_related("realm").filter(name__iexact__in=stream_names,
-        #                                               realm_id=realm_id)
+        # Stream.objects.select_related().filter(name__iexact__in=stream_names,
+        #                                        realm_id=realm_id)
         #
         # But chaining __in and __iexact doesn't work with Django's
         # ORM, so we have the following hack to construct the relevant where clause
         upper_list = ", ".join(["UPPER(%s)"] * len(stream_names))
         where_clause = "UPPER(zerver_stream.name::text) IN (%s)" % (upper_list,)
-        return get_active_streams(realm.id).select_related("realm").extra(
+        return get_active_streams(realm.id).select_related().extra(
             where=[where_clause],
             params=stream_names)