diff --git a/index.d.ts b/index.d.ts
index 504d0b3..17218f4 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -57,7 +57,7 @@ export interface ClientOptions {
 	transport?: Transport,
 	timestamp?: Date,
 	msgid?: string,
-	udpBindAddress: string
+	udpBindAddress?: string
 }
 
 export interface MessageOptions {