diff --git a/state/state_object.go b/state/state_object.go
index 487952a022..51ec95efad 100644
--- a/state/state_object.go
+++ b/state/state_object.go
@@ -290,7 +290,7 @@ func (c *StateObject) Init() Code {
 	return c.initCode
 }
 
-func (self *StateObject) Trie() *trie.Trie {
+func (self *StateObject) Trie() *trie.SecureTrie {
 	return self.State.trie
 }
 
diff --git a/state/statedb.go b/state/statedb.go
index 7e2b24b941..ee37c2e68e 100644
--- a/state/statedb.go
+++ b/state/statedb.go
@@ -18,7 +18,7 @@ var statelogger = logger.NewLogger("STATE")
 // * Accounts
 type StateDB struct {
 	db   ethutil.Database
-	trie *trie.Trie
+	trie *trie.SecureTrie
 
 	stateObjects map[string]*StateObject
 
@@ -29,7 +29,7 @@ type StateDB struct {
 
 // Create a new state from a given trie
 func New(root []byte, db ethutil.Database) *StateDB {
-	trie := trie.New(ethutil.CopyBytes(root), db)
+	trie := trie.NewSecure(ethutil.CopyBytes(root), db)
 	return &StateDB{db: db, trie: trie, stateObjects: make(map[string]*StateObject), refund: make(map[string]*big.Int)}
 }
 
diff --git a/trie/secure_trie.go b/trie/secure_trie.go
index f49547ed89..b9fa376b81 100644
--- a/trie/secure_trie.go
+++ b/trie/secure_trie.go
@@ -30,3 +30,7 @@ func (self *SecureTrie) Delete(key []byte) Node {
 func (self *SecureTrie) DeleteString(key string) Node {
 	return self.Delete([]byte(key))
 }
+
+func (self *SecureTrie) Copy() *SecureTrie {
+	return &SecureTrie{self.Trie.Copy()}
+}