diff --git a/lib/result.js b/lib/result.js
index 9eeb050..d48997d 100644
--- a/lib/result.js
+++ b/lib/result.js
@@ -58,7 +58,7 @@ function logNodeSet(node) {
         console.log(JSON.stringify(node,' ',4));
         return;
     }
-    if (util.isArray(node)) {
+    if (Array.isArray(node)) {
         if (node.length > 0) {
             node = node[0];
         }
@@ -79,7 +79,7 @@ function logNodeList(nodes) {
         console.log(JSON.stringify(nodes,' ',4));
         return;
     }
-    if (!util.isArray(nodes)) {
+    if (!Array.isArray(nodes)) {
         nodes = [nodes];
     }
     nodes.sort(function(n1,n2) {