diff --git a/BST.java b/BST.java
index 544e77d..c8cc096 100644
--- a/BST.java
+++ b/BST.java
@@ -7,7 +7,7 @@ private class Node {
 		Node right;
 	}
 
-	private Node root;
+	private Node root=null;
 
 	public BSTT(int arr[]) {
 		this.root = construct(arr, 0, arr.length - 1);