diff --git a/src/types/universes.ts b/src/types/universes.ts
index 173fc22..c1e4567 100644
--- a/src/types/universes.ts
+++ b/src/types/universes.ts
@@ -86,7 +86,7 @@ export interface SpeechAssetResponse extends SpeechAssetOperation {
 
 export interface GameJoinRestriction {
   active: boolean;
-  duration: string;
+  duration?: string;
   privateReason: string;
   displayReason: string;
   excludeAltAccounts: boolean;