diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index 1b4226a2..664588e7 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -781,10 +781,7 @@ script.multisig = function(keys, m, n) {
   while (keys.length < n)
     keys.push([]);
 
-  // Keys need to be in a predictable order.
-  keys = keys.sort(function(a, b) {
-    return new bn(a).cmp(new bn(b)) > 0;
-  });
+  keys = utils.sortKeys(keys);
 
   return [ m ].concat(
     keys,
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index 36afab7d..b63aeea9 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -586,3 +586,9 @@ utils.hidden = function(obj, prop, value) {
   });
   return obj;
 };
+
+utils.sortKeys = function(keys) {
+  return keys.sort(function(a, b) {
+    return new bn(a).cmp(new bn(b)) > 0;
+  });
+};
diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index 323246a6..2b3e6b9c 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -170,10 +170,7 @@ Wallet.prototype.addKey = function addKey(key) {
 
   this.keys.push(key);
 
-  // Keys need to be in a predictable order.
-  this.keys = this.keys.sort(function(a, b) {
-    return new bn(a).cmp(new bn(b)) > 0;
-  });
+  this.keys = utils.sortKeys(this.keys);
 };
 
 Wallet.prototype.removeKey = function removeKey(key) {
@@ -190,10 +187,7 @@ Wallet.prototype.removeKey = function removeKey(key) {
 
   this.keys.splice(index, 1);
 
-  // Keys need to be in a predictable order.
-  this.keys = this.keys.sort(function(a, b) {
-    return new bn(a).cmp(new bn(b)) > 0;
-  });
+  this.keys = utils.sortKeys(this.keys);
 };
 
 Wallet.prototype.derive = function derive() {
@@ -267,10 +261,7 @@ Wallet.prototype.getPublicKey = function getPublicKey(enc) {
 Wallet.prototype.getPublicKeys = function() {
   var keys = this.keys.slice().map(utils.toKeyArray);
 
-  // Keys need to be in a predictable order.
-  keys = keys.sort(function(a, b) {
-    return new bn(a).cmp(new bn(b)) > 0;
-  });
+  keys = utils.sortKeys(keys);
 
   return keys;
 };