diff --git a/src/Stage.js b/src/Stage.js
index 57fb5155..99ca16b0 100644
--- a/src/Stage.js
+++ b/src/Stage.js
@@ -121,7 +121,7 @@
          */
         clear: function() {
             var layers = this.children,
-                len = length,
+                len = layers.length,
                 n;
                 
             for(n = 0; n < len; n++) {