diff --git a/keyserver/src/updaters/thread-permission-updaters.js b/keyserver/src/updaters/thread-permission-updaters.js
--- a/keyserver/src/updaters/thread-permission-updaters.js
+++ b/keyserver/src/updaters/thread-permission-updaters.js
@@ -13,7 +13,11 @@
 } from 'lib/permissions/thread-permissions.js';
 import type { CalendarQuery } from 'lib/types/entry-types.js';
 import { messageTypes } from 'lib/types/message-types-enum.js';
-import type { ThreadSubscription } from 'lib/types/subscription-types.js';
+import {
+  type ThreadSubscription,
+  defaultThreadSubscription,
+  joinThreadSubscription,
+} from 'lib/types/subscription-types.js';
 import type {
   ThreadPermissionsBlob,
   ThreadRolePermissionsBlob,
@@ -912,11 +916,8 @@
   return { membershipRows, relationshipChangeset };
 }
 
-const defaultSubscriptionString = JSON.stringify({
-  home: false,
-  pushNotifs: false,
-});
-const joinSubscriptionString = JSON.stringify({ home: true, pushNotifs: true });
+const defaultSubscriptionString = JSON.stringify(defaultThreadSubscription);
+const joinSubscriptionString = JSON.stringify(joinThreadSubscription);
 
 const membershipInsertBatchSize = 50;
 
diff --git a/lib/types/subscription-types.js b/lib/types/subscription-types.js
--- a/lib/types/subscription-types.js
+++ b/lib/types/subscription-types.js
@@ -37,4 +37,13 @@
   pushNotifs: false,
 };
 
-export { defaultThreadSubscription, threadSubscriptions };
+const joinThreadSubscription: ThreadSubscription = {
+  home: true,
+  pushNotifs: true,
+};
+
+export {
+  threadSubscriptions,
+  defaultThreadSubscription,
+  joinThreadSubscription,
+};