diff --git a/lib/util.js b/lib/util.js
index 65888920c8..53775e74da 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -162,8 +162,8 @@ function stylizeWithColor(str, styleType) {
   var style = styles[styleType];
 
   if (style) {
-    return '\033[' + colors[style][0] + 'm' + str +
-           '\033[' + colors[style][1] + 'm';
+    return '\u001b[' + colors[style][0] + 'm' + str +
+           '\u001b[' + colors[style][1] + 'm';
   } else {
     return str;
   }