diff --git a/lib/client.js b/lib/client.js
index 41eb476..6695a33 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -293,7 +293,7 @@ export default class Client extends EventTarget {
 		}
 	}
 
-	whois(target, callback) {
+	whois(target) {
 		var targetCM = this.cm(target);
 		var msg = { command: "WHOIS", params: [target] };
 		return this.roundtrip(msg, (event) => {