diff --git a/lib/bcoin/env.js b/lib/bcoin/env.js
index 21274203..2bad1966 100644
--- a/lib/bcoin/env.js
+++ b/lib/bcoin/env.js
@@ -324,8 +324,11 @@ Environment.prototype.mkdir = function mkdir(path, dirname) {
  */
 
 Environment.prototype.debug = function debug() {
-  var args = Array.prototype.slice.call(arguments);
-  var msg;
+  var args = new Array(arguments.length);
+  var i, msg;
+
+  for (i = 0; i < args.length; i++)
+    args[i] = arguments[i];
 
   if (this.logger) {
     if (this.debugLogs)
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index 701965b2..1f89ed17 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -625,12 +625,17 @@ utils.revHex = function revHex(s) {
  */
 
 utils.merge = function merge(target) {
-  var args = Array.prototype.slice.call(arguments, 1);
-  args.forEach(function(obj) {
-    Object.keys(obj).forEach(function(key) {
+  var i, j, obj, keys, key;
+
+  for (i = 1; i < arguments.length; i++) {
+    obj = arguments[i];
+    keys = Object.keys(obj);
+    for (j = 0; j < keys.length; j++) {
+      key = keys[j];
       target[key] = obj[key];
-    });
-  });
+    }
+  }
+
   return target;
 };
 
@@ -883,8 +888,11 @@ utils.format = function format(args, color) {
  */
 
 utils.print = function print() {
-  var args = Array.prototype.slice.call(arguments);
-  var msg;
+  var args = new Array(arguments.length);
+  var i, msg;
+
+  for (i = 0; i < args.length; i++)
+    args[i] = arguments[i];
 
   if (utils.isBrowser) {
     msg = typeof args[0] !== 'object'
@@ -905,8 +913,11 @@ utils.print = function print() {
  */
 
 utils.error = function error() {
-  var args = Array.prototype.slice.call(arguments);
-  var msg;
+  var args = new Array(arguments.length);
+  var i, msg;
+
+  for (i = 0; i < args.length; i++)
+    args[i] = arguments[i];
 
   if (utils.isBrowser) {
     msg = typeof args[0] !== 'object'
diff --git a/lib/bcoin/walletdb.js b/lib/bcoin/walletdb.js
index 9ca3666b..d5081fc5 100644
--- a/lib/bcoin/walletdb.js
+++ b/lib/bcoin/walletdb.js
@@ -296,12 +296,17 @@ WalletDB.prototype.unregister = function unregister(wallet) {
  */
 
 WalletDB.prototype.fire = function fire(id) {
-  var args = Array.prototype.slice.call(arguments, 1);
   var watcher = this.watchers[id];
+  var i, args;
 
   if (!watcher)
     return;
 
+  args = new Array(arguments.length - 1);
+
+  for (i = 1; i < arguments.length; i++)
+    args[i - 1] = arguments[i];
+
   watcher.wallet.emit.apply(watcher.wallet, args);
 };
 
diff --git a/lib/bcoin/workers.js b/lib/bcoin/workers.js
index fa170523..60bdcace 100644
--- a/lib/bcoin/workers.js
+++ b/lib/bcoin/workers.js
@@ -427,7 +427,12 @@ Worker.prototype.send = function send(job, name, items) {
  */
 
 Worker.prototype.sendEvent = function sendEvent() {
-  var items = Array.prototype.slice.call(arguments);
+  var items = new Array(arguments.length);
+  var i;
+
+  for (i = 0; i < items.length; i++)
+    items[i] = arguments[i];
+
   return this.send(0, 'event', items);
 };
 
@@ -590,7 +595,12 @@ Master.prototype.send = function send(job, name, items) {
  */
 
 Master.prototype.sendEvent = function sendEvent() {
-  var items = Array.prototype.slice.call(arguments);
+  var items = new Array(arguments.length);
+  var i;
+
+  for (i = 0; i < items.length; i++)
+    items[i] = arguments[i];
+
   return this.send(0, 'event', items);
 };
 
@@ -601,12 +611,15 @@ Master.prototype.sendEvent = function sendEvent() {
  */
 
 Master.prototype.debug = function debug() {
-  var args, msg;
+  var i, args, msg;
 
   if (!this.options.debug)
     return;
 
-  args = Array.prototype.slice.call(arguments);
+  args = new Array(arguments.length);
+
+  for (i = 0; i < args.length; i++)
+    args[i] = arguments[i];
 
   msg = utils.format(args, false);
   msg = utils.format(['Worker %d: %s', this.id, msg], false);