diff --git a/lib/index.js b/lib/index.js
index 9652e5f9a8..71b03e93d4 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -80,10 +80,7 @@ VM.prototype.runCall = require('./runCall.js')
 VM.prototype.runBlockchain = require('./runBlockchain.js')
 
 VM.prototype.copy = function () {
-  return new VM({
-    state: this.trie.copy(),
-    blockchain: this.blockchain
-  })
+  return new VM({ stateManager: this.stateManager.copy() })
 }
 
 /**
diff --git a/lib/stateManager.js b/lib/stateManager.js
index 4bd9b35d20..b1663c6c7d 100644
--- a/lib/stateManager.js
+++ b/lib/stateManager.js
@@ -33,6 +33,10 @@ function StateManager (opts) {
 
 var proto = StateManager.prototype
 
+proto.copy = function () {
+  return new StateManager({ trie: this.trie.copy(), blockchain: this.blockchain })
+}
+
 // gets the account from the cache, or triggers a lookup and stores
 // the result in the cache
 proto.getAccount = function (address, cb) {