diff --git a/lib/types/thread-types.js b/lib/types/thread-types.js
--- a/lib/types/thread-types.js
+++ b/lib/types/thread-types.js
@@ -213,7 +213,7 @@
   +containingThreadID: ?string,
   +community: ?string,
   +members: $ReadOnlyArray<MemberInfo>,
-  +roles: { [id: string]: RoleInfo },
+  +roles: { +[id: string]: RoleInfo },
   +currentUser: ThreadCurrentUserInfo,
   +sourceMessageID?: string,
   +repliesCount: number,
@@ -233,7 +233,7 @@
   +containingThreadID: ?string,
   +community: ?string,
   +members: $ReadOnlyArray<RelativeMemberInfo>,
-  +roles: { [id: string]: RoleInfo },
+  +roles: { +[id: string]: RoleInfo },
   +currentUser: ThreadCurrentUserInfo,
   +sourceMessageID?: string,
   +repliesCount: number,
@@ -253,7 +253,7 @@
   +containingThreadID: ?string,
   +community: ?string,
   +members: $ReadOnlyArray<RelativeMemberInfo>,
-  +roles: { [id: string]: RoleInfo },
+  +roles: { +[id: string]: RoleInfo },
   +currentUser: ThreadCurrentUserInfo,
   +sourceMessageID?: string,
   +repliesCount: number,
@@ -282,7 +282,7 @@
   +community: ?string,
   +depth: number,
   +members: $ReadOnlyArray<ServerMemberInfo>,
-  +roles: { [id: string]: RoleInfo },
+  +roles: { +[id: string]: RoleInfo },
   +sourceMessageID?: string,
   +repliesCount: number,
   +pinnedCount: number,