diff --git a/src/mago3d/f4d/BlocksList.js b/src/mago3d/f4d/BlocksList.js
index cf0fbb29..d6d1045b 100644
--- a/src/mago3d/f4d/BlocksList.js
+++ b/src/mago3d/f4d/BlocksList.js
@@ -160,6 +160,7 @@ BlocksList.prototype.stepOverBlockVersioned = function(arrayBuffer, bytesReaded,
 	var normalByteValuesCount;
 	var shortIndicesValuesCount;
 	var sizeLevels;
+	var startBuff, endBuff;
 	
 	// Spec document Table 3-1
 	// vboCount