diff --git a/accounts/account_manager.go b/accounts/account_manager.go
index 86f9c5916..f87cce65f 100644
--- a/accounts/account_manager.go
+++ b/accounts/account_manager.go
@@ -33,6 +33,7 @@ and accounts persistence is derived from stored keys' addresses
 package accounts
 
 import (
+	"crypto/ecdsa"
 	crand "crypto/rand"
 
 	"errors"
@@ -52,17 +53,17 @@ type Account struct {
 }
 
 type AccountManager struct {
-	keyStore           crypto.KeyStore2
-	unlockedKeys       map[string]crypto.Key
-	unlockMilliseconds time.Duration
-	mutex              sync.RWMutex
+	keyStore     crypto.KeyStore2
+	unlockedKeys map[string]crypto.Key
+	unlockTime   time.Duration
+	mutex        sync.RWMutex
 }
 
-func NewAccountManager(keyStore crypto.KeyStore2, unlockMilliseconds time.Duration) *AccountManager {
+func NewAccountManager(keyStore crypto.KeyStore2, unlockTime time.Duration) *AccountManager {
 	return &AccountManager{
-		keyStore:           keyStore,
-		unlockedKeys:       make(map[string]crypto.Key),
-		unlockMilliseconds: unlockMilliseconds,
+		keyStore:     keyStore,
+		unlockedKeys: make(map[string]crypto.Key),
+		unlockTime:   unlockTime,
 	}
 }
 
@@ -144,7 +145,7 @@ func (am *AccountManager) Accounts() ([]Account, error) {
 
 func unlockLater(am *AccountManager, addr []byte) {
 	select {
-	case <-time.After(time.Millisecond * am.unlockMilliseconds):
+	case <-time.After(am.unlockTime):
 	}
 	am.mutex.RLock()
 	// TODO: how do we know the key is actually gone from memory?
diff --git a/accounts/accounts_test.go b/accounts/accounts_test.go
index d8187220a..30e0b011a 100644
--- a/accounts/accounts_test.go
+++ b/accounts/accounts_test.go
@@ -12,7 +12,7 @@ import (
 
 func TestAccountManager(t *testing.T) {
 	ks := crypto.NewKeyStorePlain(ethutil.DefaultDataDir() + "/testaccounts")
-	am := NewAccountManager(ks, 100)
+	am := NewAccountManager(ks, 100*time.Millisecond)
 	pass := "" // not used but required by API
 	a1, err := am.NewAccount(pass)
 	toSign := randentropy.GetEntropyCSPRNG(32)
@@ -22,7 +22,7 @@ func TestAccountManager(t *testing.T) {
 	}
 
 	// Cleanup
-	time.Sleep(time.Millisecond * 150) // wait for locking
+	time.Sleep(150 * time.Millisecond) // wait for locking
 
 	accounts, err := am.Accounts()
 	if err != nil {
@@ -38,7 +38,7 @@ func TestAccountManager(t *testing.T) {
 
 func TestAccountManagerLocking(t *testing.T) {
 	ks := crypto.NewKeyStorePassphrase(ethutil.DefaultDataDir() + "/testaccounts")
-	am := NewAccountManager(ks, 200)
+	am := NewAccountManager(ks, 200*time.Millisecond)
 	pass := "foo"
 	a1, err := am.NewAccount(pass)
 	toSign := randentropy.GetEntropyCSPRNG(32)
@@ -62,7 +62,7 @@ func TestAccountManagerLocking(t *testing.T) {
 	}
 
 	// Signing without passphrase fails after automatic locking
-	time.Sleep(time.Millisecond * time.Duration(250))
+	time.Sleep(250 * time.Millisecond)
 
 	_, err = am.Sign(a1, toSign)
 	if err != ErrLocked {