diff --git a/deno/gateway/v9.ts b/deno/gateway/v9.ts
index 9ee575fd..d3e9758f 100644
--- a/deno/gateway/v9.ts
+++ b/deno/gateway/v9.ts
@@ -1285,7 +1285,7 @@ export interface GatewayThreadCreateDispatchData extends APIThreadChannel {
 	/**
 	 * Whether the thread is newly created or not.
 	 */
-	newly_created: boolean;
+	newly_created?: true;
 }
 
 /**
diff --git a/gateway/v9.ts b/gateway/v9.ts
index c8701a34..68cd6c4b 100644
--- a/gateway/v9.ts
+++ b/gateway/v9.ts
@@ -1285,7 +1285,7 @@ export interface GatewayThreadCreateDispatchData extends APIThreadChannel {
 	/**
 	 * Whether the thread is newly created or not.
 	 */
-	newly_created: boolean;
+	newly_created?: true;
 }
 
 /**