diff --git a/src/core/Engine.js b/src/core/Engine.js
index 017421f..2e06a0f 100644
--- a/src/core/Engine.js
+++ b/src/core/Engine.js
@@ -183,7 +183,7 @@ var Engine = {};
      * @return engine
      */
     Engine.update = function(engine, delta, correction) {
-        correction = correction || 1;
+        correction = (typeof correction !== 'undefined') ? correction : 1;
 
         var world = engine.world,
             timing = engine.timing,