diff --git a/lib/interface/client.js b/lib/interface/client.js
index 17504a3..297b46a 100644
--- a/lib/interface/client.js
+++ b/lib/interface/client.js
@@ -58,7 +58,7 @@ Client.prototype = {
     },
 
     getListsForEmail: function (emailAddress, callback) {
-        this.createsend.get('clients/' + this.clientId + '/listsforemail.json', new { 'email': emailAddress }, null, callback);
+        this.createsend.get('clients/' + this.clientId + '/listsforemail.json', { 'email': emailAddress }, null, callback);
     },
 
     getScheduledCampaigns: function (callback) {
@@ -99,7 +99,7 @@ Client.prototype = {
     },
 
     suppress: function (emailAddress, callback) {
-        this.createsend.post('clients/' + this.clientId + '/suppress.json', null, new { 'EmailAddress': emailAddress }, callback);
+        this.createsend.post('clients/' + this.clientId + '/suppress.json', null, { 'EmailAddress': emailAddress }, callback);
     },
 
     transferCredits: function (details, callback) {
@@ -112,6 +112,6 @@ Client.prototype = {
     },
 
     unsuppress: function (emailAddress, callback) {
-        this.createsend.put('clients/' + this.clientId + '/unsuppress.json', new { 'email': emailAddress }, null, callback);
+        this.createsend.put('clients/' + this.clientId + '/unsuppress.json', { 'email': emailAddress }, null, callback);
     }
 }
diff --git a/lib/interface/clients.js b/lib/interface/clients.js
index 0bc79b7..a0077ad 100644
--- a/lib/interface/clients.js
+++ b/lib/interface/clients.js
@@ -52,7 +52,7 @@ Clients.prototype = {
         new Client(this.createsend, clientId).getPrimaryContact(callback);
     },
 
-    getListsForEmail: function (clientId, callback) {
+    getListsForEmail: function (clientId, emailAddress, callback) {
         new Client(this.createsend, clientId).getListsForEmail(emailAddress, callback);
     },