diff --git a/lib/types/link-types.js b/lib/types/link-types.js
index 3c83d53bf..e2bc2b914 100644
--- a/lib/types/link-types.js
+++ b/lib/types/link-types.js
@@ -1,45 +1,45 @@
 // @flow
 
 import t, { type TInterface } from 'tcomb';
 
 import { tID, tShape } from '../utils/validation-utils.js';
 
 export type InviteLinkVerificationRequest = {
   +secret: string,
 };
 
 export type InviteLinkVerificationResponse =
   | {
       +status: 'valid' | 'already_joined',
       +community: {
         +name: string,
         +id: string,
       },
     }
   | {
       +status: 'invalid' | 'expired',
     };
 
 export type InviteLink = {
   +name: string,
   +primary: boolean,
   +role: string,
   +communityID: string,
-  +expirationTime: number,
-  +limitOfUses: number,
+  +expirationTime: ?number,
+  +limitOfUses: ?number,
   +numberOfUses: number,
 };
 
 export const inviteLinkValidator: TInterface<InviteLink> = tShape<InviteLink>({
   name: t.String,
   primary: t.Boolean,
   role: tID,
   communityID: tID,
-  expirationTime: t.Number,
-  limitOfUses: t.Number,
+  expirationTime: t.maybe(t.Number),
+  limitOfUses: t.maybe(t.Number),
   numberOfUses: t.Number,
 });
 
 export type FetchInviteLinksResponse = {
   +links: $ReadOnlyArray<InviteLink>,
 };