diff --git a/examples/compositeManipulation.js b/examples/compositeManipulation.js
index d95d95e..3d56e6b 100644
--- a/examples/compositeManipulation.js
+++ b/examples/compositeManipulation.js
@@ -52,7 +52,7 @@ Example.compositeManipulation = function() {
 
     Events.on(engine, 'afterUpdate', function(event) {
         var time = engine.timing.timestamp,
-            timeScale = event.delta / 1000;
+            timeScale = (event.delta || (1000 / 60)) / 1000;
 
         Composite.translate(stack, {
             x: Math.sin(time * 0.001) * 10 * timeScale,
diff --git a/examples/manipulation.js b/examples/manipulation.js
index 008361f..31d4126 100644
--- a/examples/manipulation.js
+++ b/examples/manipulation.js
@@ -64,7 +64,7 @@ Example.manipulation = function() {
         scaleRate = 0.6;
 
     Events.on(engine, 'beforeUpdate', function(event) {
-        var timeScale = event.delta / 1000;
+        var timeScale = (event.delta || (1000 / 60)) / 1000;
 
         if (scaleRate > 0) {
             Body.scale(bodyF, 1 + (scaleRate * timeScale), 1 + (scaleRate * timeScale));
diff --git a/src/core/Engine.js b/src/core/Engine.js
index 1e38d2d..f4e9e39 100644
--- a/src/core/Engine.js
+++ b/src/core/Engine.js
@@ -343,6 +343,7 @@ var Body = require('../body/Body');
     * @event beforeUpdate
     * @param {} event An event object
     * @param {number} event.timestamp The engine.timing.timestamp of the event
+    * @param {number} event.delta The delta time in milliseconds value used in the update
     * @param {} event.source The source object of the event
     * @param {} event.name The name of the event
     */
@@ -353,6 +354,7 @@ var Body = require('../body/Body');
     * @event afterUpdate
     * @param {} event An event object
     * @param {number} event.timestamp The engine.timing.timestamp of the event
+    * @param {number} event.delta The delta time in milliseconds value used in the update
     * @param {} event.source The source object of the event
     * @param {} event.name The name of the event
     */
@@ -388,6 +390,7 @@ var Body = require('../body/Body');
     * @param {} event An event object
     * @param {} event.pairs List of affected pairs
     * @param {number} event.timestamp The engine.timing.timestamp of the event
+    * @param {number} event.delta The delta time in milliseconds value used in the update
     * @param {} event.source The source object of the event
     * @param {} event.name The name of the event
     */