diff --git a/lib/db/memdb.js b/lib/db/memdb.js
index d3a4a645..64181ee7 100644
--- a/lib/db/memdb.js
+++ b/lib/db/memdb.js
@@ -7,7 +7,7 @@
 'use strict';
 
 var assert = require('assert');
-var util = require('../utils/util');
+var nextTick = require('../utils/nexttick');
 var RBT = require('../utils/rbt');
 var DUMMY = Buffer.alloc(0);
 
@@ -130,7 +130,7 @@ MemDB.prototype.open = function open(options, callback) {
 
   this.options = options;
 
-  util.nextTick(callback);
+  nextTick(callback);
 };
 
 /**
@@ -139,7 +139,7 @@ MemDB.prototype.open = function open(options, callback) {
  */
 
 MemDB.prototype.close = function close(callback) {
-  util.nextTick(callback);
+  nextTick(callback);
 };
 
 /**
@@ -166,7 +166,7 @@ MemDB.prototype.get = function get(key, options, callback) {
     err = new Error('MEMDB_NOTFOUND: Key not found.');
     err.notFound = true;
     err.type = 'NotFoundError';
-    util.nextTick(function() {
+    nextTick(function() {
       callback(err);
     });
     return;
@@ -175,7 +175,7 @@ MemDB.prototype.get = function get(key, options, callback) {
   if (options.asBuffer === false)
     value = value.toString('utf8');
 
-  util.nextTick(function() {
+  nextTick(function() {
     callback(null, value);
   });
 };
@@ -196,7 +196,7 @@ MemDB.prototype.put = function put(key, value, options, callback) {
 
   this.insert(key, value);
 
-  util.nextTick(callback);
+  nextTick(callback);
 };
 
 /**
@@ -214,7 +214,7 @@ MemDB.prototype.del = function del(key, options, callback) {
 
   this.remove(key);
 
-  util.nextTick(callback);
+  nextTick(callback);
 };
 
 /**
@@ -282,7 +282,7 @@ MemDB.prototype.approximateSize = function approximateSize(start, end, callback)
     size += item.value.length;
   }
 
-  util.nextTick(function() {
+  nextTick(function() {
     callback(null, size);
   });
 };
@@ -294,7 +294,7 @@ MemDB.prototype.approximateSize = function approximateSize(start, end, callback)
  */
 
 MemDB.destroy = function destroy(location, callback) {
-  util.nextTick(callback);
+  nextTick(callback);
 };
 
 /**
@@ -304,7 +304,7 @@ MemDB.destroy = function destroy(location, callback) {
  */
 
 MemDB.repair = function repair(location, callback) {
-  util.nextTick(callback);
+  nextTick(callback);
 };
 
 /**
@@ -355,7 +355,7 @@ Batch.prototype.write = function write(callback) {
   var i, op;
 
   if (this.written) {
-    util.nextTick(function() {
+    nextTick(function() {
       callback(new Error('Already written.'));
     });
     return;
@@ -371,7 +371,7 @@ Batch.prototype.write = function write(callback) {
         this.db.remove(op.key);
         break;
       default:
-        util.nextTick(function() {
+        nextTick(function() {
           callback(new Error('Bad operation: ' + op.type));
         });
         return;
@@ -381,7 +381,7 @@ Batch.prototype.write = function write(callback) {
   this.ops = [];
   this.written = true;
 
-  util.nextTick(callback);
+  nextTick(callback);
 
   return this;
 };
@@ -474,7 +474,7 @@ Iterator.prototype.next = function(callback) {
   var key, value, result;
 
   if (!this.iter) {
-    util.nextTick(function() {
+    nextTick(function() {
       callback(new Error('Cannot call next after end.'));
     });
     return;
@@ -510,14 +510,14 @@ Iterator.prototype.next = function(callback) {
 
   if (!result) {
     this.iter = null;
-    util.nextTick(callback);
+    nextTick(callback);
     return;
   }
 
   if (options.limit !== -1) {
     if (this.total >= options.limit) {
       this.iter = null;
-      util.nextTick(callback);
+      nextTick(callback);
       return;
     }
     this.total += 1;
@@ -538,7 +538,7 @@ Iterator.prototype.next = function(callback) {
   if (!options.valueAsBuffer)
     value = value.toString('utf8');
 
-  util.nextTick(function() {
+  nextTick(function() {
     callback(null, key, value);
   });
 };
@@ -569,7 +569,7 @@ Iterator.prototype.seek = function seek(key) {
 
 Iterator.prototype.end = function end(callback) {
   if (this.ended) {
-    util.nextTick(function() {
+    nextTick(function() {
       callback(new Error('Already ended.'));
     });
     return;
@@ -578,7 +578,7 @@ Iterator.prototype.end = function end(callback) {
   this.ended = true;
   this.iter = null;
 
-  util.nextTick(callback);
+  nextTick(callback);
 };
 
 /**
diff --git a/lib/utils/util.js b/lib/utils/util.js
index 7415f3c6..376c9426 100644
--- a/lib/utils/util.js
+++ b/lib/utils/util.js
@@ -139,15 +139,6 @@ util.isHex = function isHex(obj) {
     && obj.length % 2 === 0;
 };
 
-/**
- * Call `setImmediate`, `process.nextTick`,
- * or `setInterval` depending.
- * @function
- * @returns {Promise}
- */
-
-util.nextTick = require('./nexttick');
-
 /**
  * Reverse a hex-string (used because of
  * bitcoind's affinity for uint256le).
diff --git a/lib/workers/master.js b/lib/workers/master.js
index 4792ea88..a721ef0f 100644
--- a/lib/workers/master.js
+++ b/lib/workers/master.js
@@ -10,6 +10,7 @@
 var assert = require('assert');
 var EventEmitter = require('events').EventEmitter;
 var util = require('../utils/util');
+var nextTick = require('../utils/nexttick');
 var Network = require('../protocol/network');
 var jobs = require('./jobs');
 var Parser = require('./parser-client');
@@ -117,7 +118,7 @@ Master.prototype._initChildProcess = function _initChildProcess() {
 
   process.on('uncaughtException', function(err) {
     self.send(new packets.ErrorPacket(err));
-    util.nextTick(function() {
+    nextTick(function() {
       process.exit(1);
     });
   });
diff --git a/lib/workers/workerpool.js b/lib/workers/workerpool.js
index 6f81b10b..a443db9f 100644
--- a/lib/workers/workerpool.js
+++ b/lib/workers/workerpool.js
@@ -12,6 +12,7 @@ var EventEmitter = require('events').EventEmitter;
 var os = require('os');
 var cp = require('child_process');
 var util = require('../utils/util');
+var nextTick = require('../utils/nexttick');
 var co = require('../utils/co');
 var Network = require('../protocol/network');
 var jobs = require('./jobs');
@@ -272,7 +273,7 @@ WorkerPool.prototype.execute = function execute(packet, timeout) {
 
   if (!this.enabled || !WorkerPool.support) {
     return new Promise(function(resolve, reject) {
-      util.nextTick(function() {
+      nextTick(function() {
         try {
           result = jobs._execute(packet);
         } catch (e) {