diff --git a/lib/timeline.js b/lib/timeline.js
index 99fe31b..375a078 100644
--- a/lib/timeline.js
+++ b/lib/timeline.js
@@ -31,8 +31,9 @@ Timeline.Pin = Pin;
  */
 Timeline.prototype.sendUserPin = function (userToken, pin, callback) {
   if (typeof userToken !== 'string') {
-    process.nextTick(callback(new Error('Expected userToken to be a string.')));
-    return;
+    return process.nextTick(function () {
+      callback(new Error('Expected userToken to be a string.'));
+    });
   }
 
   if (!(pin instanceof Pin)) {
@@ -60,13 +61,15 @@ Timeline.prototype.sendUserPin = function (userToken, pin, callback) {
  */
 Timeline.prototype.sendSharedPin = function (topics, pin, callback) {
   if (!this._apiKey) {
-    process.nextTick(callback(new Error('API Key not set.')));
-    return;
+    return process.nextTick(function () {
+      callback(new Error('API Key not set.'));
+    });
   }
 
   if (!(topics instanceof Array)) {
-    process.nextTick(callback(new Error('Expected topics to be an array.')))
-    return;
+    return process.nextTick(function () {
+      callback(new Error('Expected topics to be an array.'));
+    });
   }
 
   if (!(pin instanceof Pin)) {
@@ -95,8 +98,9 @@ Timeline.prototype.sendSharedPin = function (topics, pin, callback) {
  */
 Timeline.prototype.deleteUserPin = function (userToken, pin, callback) {
   if (typeof userToken !== 'string') {
-    process.nextTick(callback(new Error('Expected userToken to be a string.')));
-    return;
+    return process.nextTick(function () {
+      callback(new Error('Expected userToken to be a string.'));
+    });
   }
 
   if (!(pin instanceof Pin)) {
@@ -123,13 +127,15 @@ Timeline.prototype.deleteUserPin = function (userToken, pin, callback) {
  */
 Timeline.prototype.subscribe = function (userToken, topic, callback) {
   if (typeof userToken !== 'string') {
-    process.nextTick(callback(new Error('Expected userToken to be a string.')));
-    return;
+    return process.nextTick(function () {
+      callback(new Error('Expected userToken to be a string.'));
+    });
   }
 
   if (typeof topic !== 'string') {
-    process.nextTick(callback(new Error('Expected topic to be a string.')));
-    return;
+    return process.nextTick(function () {
+      callback(new Error('Expected topic to be a string.'));
+    });
   }
 
   var opts = {
@@ -152,13 +158,15 @@ Timeline.prototype.subscribe = function (userToken, topic, callback) {
  */
 Timeline.prototype.unsubscribe = function (userToken, topic, callback) {
   if (typeof userToken !== 'string') {
-    process.nextTick(callback(new Error('Expected userToken to be a string.')));
-    return;
+    return process.nextTick(function () {
+      callback(new Error('Expected userToken to be a string.'));
+    });
   }
 
   if (typeof topic !== 'string') {
-    process.nextTick(callback(new Error('Expected topic to be a string.')));
-    return;
+    return process.nextTick(function () {
+      callback(new Error('Expected topic to be a string.'));
+    });
   }
 
   var opts = {
@@ -192,18 +200,15 @@ Timeline.prototype._request = function(opts, callback) {
 
   request(reqOpts, function (err, res, body) {
     if (err) {
-      callback(err, body, res);
-      return;
+      return callback(err, body, res);
     }
 
     if (res.statusCode < 300) {
-      callback(null, body, res);
-      return;
+      return callback(null, body, res);
     }
 
     if (Timeline.errorCodes[res.statusCode]) {
-      callback(new Error(Timeline.errorCodes[res.statusCode]), body, res);
-      return;
+      return callback(new Error(Timeline.errorCodes[res.statusCode]), body, res);
     }
 
     callback(new Error('Unknown error. Status code: ' + res.statusCode), body, res);