diff --git a/index.js b/index.js
index fc90e82..72ebf1b 100644
--- a/index.js
+++ b/index.js
@@ -10,6 +10,7 @@ module.exports = function(url, apiKey) {
 prty = {
 	subscribe: function(o, cb) {
 		if (this.paramsOk(o, cb)) {
+			o.api_key = this.apiKey;
 			o.list = o.list_id;
 			delete o.list_id;
 			this.request('subscribe', o, this.getSub(cb));
@@ -17,6 +18,7 @@ prty = {
 	},
 	unsubscribe: function(o, cb) {
 		if (this.paramsOk(o, cb)) {
+			o.api_key = this.apiKey;
 			o.list = o.list_id;
 			delete o.list_id;
 			this.request('unsubscribe', o, this.getSub(cb));