diff --git a/lib/jsdoc/util/dumper.js b/lib/jsdoc/util/dumper.js
index 515c9729..a408b5bd 100644
--- a/lib/jsdoc/util/dumper.js
+++ b/lib/jsdoc/util/dumper.js
@@ -2,7 +2,7 @@
  * Recursively print out all names and values in a data structure.
  * @module jsdoc/util/dumper
  */
-const util = require('util');
+const _ = require('underscore');
 
 const OBJECT_WALKER_KEY = 'hasBeenSeenByWalkerDumper';
 const SET_DEFINED = (typeof Set !== 'undefined');
@@ -95,13 +95,13 @@ class ObjectWalker {
                 return newArray;
             });
         }
-        else if ( util.isRegExp(o) ) {
+        else if ( _.isRegExp(o) ) {
             result = `<RegExp ${o}>`;
         }
-        else if ( util.isDate(o) ) {
+        else if ( _.isDate(o) ) {
             result = `<Date ${o.toUTCString()}>`;
         }
-        else if ( util.isError(o) ) {
+        else if ( _.isError(o) ) {
             result = { message: o.message };
         }
         else if ( this.isFunction(o) ) {
diff --git a/plugins/eventDumper.js b/plugins/eventDumper.js
index 45e59008..e04ff167 100644
--- a/plugins/eventDumper.js
+++ b/plugins/eventDumper.js
@@ -7,7 +7,6 @@ const _ = require('underscore');
 const doop = require('jsdoc/util/doop');
 const dump = require('jsdoc/util/dumper').dump;
 const env = require('jsdoc/env');
-const util = require('util');
 
 const conf = env.conf.eventDumper || {};
 
@@ -68,7 +67,7 @@ function cleanse(e) {
 
     Object.keys(e).forEach(prop => {
         // by default, don't stringify properties that contain an array of functions
-        if (!conf.includeFunctions && util.isArray(e[prop]) && e[prop][0] &&
+        if (!conf.includeFunctions && _.isArray(e[prop]) && e[prop][0] &&
             String(typeof e[prop][0]) === 'function') {
             result[prop] = `function[${e[prop].length}]`;
         }