diff --git a/parity/main.rs b/parity/main.rs
index db9070493..8562b416d 100644
--- a/parity/main.rs
+++ b/parity/main.rs
@@ -523,6 +523,7 @@ impl Configuration {
 			client: service.client(),
 			info: Default::default(),
 			sync: sync.clone(),
+			accounts: account_service.clone(),
 		});
 		service.io().register_handler(io_handler).expect("Error registering IO handler");
 
@@ -618,20 +619,28 @@ impl Informant {
 
 const INFO_TIMER: TimerToken = 0;
 
+const ACCOUNT_TICK_TIMER: TimerToken = 10;
+const ACCOUNT_TICK_MS: u64 = 60000;
+
 struct ClientIoHandler {
 	client: Arc<Client>,
 	sync: Arc<EthSync>,
+	accounts: Arc<AccountService>,
 	info: Informant,
 }
 
 impl IoHandler<NetSyncMessage> for ClientIoHandler {
 	fn initialize(&self, io: &IoContext<NetSyncMessage>) {
 		io.register_timer(INFO_TIMER, 5000).expect("Error registering timer");
+		io.register_timer(ACCOUNT_TICK_TIMER, ACCOUNT_TICK_MS).expect("Error registering account timer");
+
 	}
 
 	fn timeout(&self, _io: &IoContext<NetSyncMessage>, timer: TimerToken) {
-		if INFO_TIMER == timer {
-			self.info.tick(&self.client, &self.sync);
+		match timer {
+			INFO_TIMER => { self.info.tick(&self.client, &self.sync); }
+			ACCOUNT_TICK_TIMER => { self.accounts.tick(); },
+			_ => {}
 		}
 	}
 }
diff --git a/util/src/keys/directory.rs b/util/src/keys/directory.rs
index d0d3393cd..a92bf4593 100644
--- a/util/src/keys/directory.rs
+++ b/util/src/keys/directory.rs
@@ -542,6 +542,8 @@ impl KeyDirectory {
 		if removes.is_empty() { return; }
 		let mut cache = self.cache.write().unwrap();
 		for key in removes { cache.remove(&key); }
+
+		cache.shrink_to_fit();
 	}
 
 	/// Reports how many keys are currently cached.
diff --git a/util/src/keys/store.rs b/util/src/keys/store.rs
index 610dda9f5..78540bdb0 100644
--- a/util/src/keys/store.rs
+++ b/util/src/keys/store.rs
@@ -135,8 +135,22 @@ impl AccountService {
 			secret_store: secret_store
 		}
 	}
+
+	#[cfg(test)]
+	fn new_test(temp: &::devtools::RandomTempPath) -> Self {
+		let secret_store = RwLock::new(SecretStore::new_test(temp));
+		AccountService {
+			secret_store: secret_store
+		}
+	}
+
+	/// Ticks the account service
+	pub fn tick(&self) {
+		self.secret_store.write().unwrap().collect_garbage();
+	}
 }
 
+
 impl Default for SecretStore {
 	fn default() -> Self {
 		SecretStore::new()
@@ -256,6 +270,20 @@ impl SecretStore {
 		let unlock = try!(read_lock.get(account).ok_or(SigningError::AccountNotUnlocked));
 		Ok(unlock.secret as crypto::Secret)
 	}
+
+	/// Makes account unlocks expire and removes unused key files from memory
+	pub fn collect_garbage(&mut self) {
+		let mut garbage_lock = self.unlocks.write().unwrap();
+		self.directory.collect_garbage();
+		let utc = UTC::now();
+		let expired_addresses = garbage_lock.iter()
+			.filter(|&(_, unlock)| unlock.expires < utc)
+			.map(|(address, _)| address.clone()).collect::<Vec<Address>>();
+
+		for expired in expired_addresses { garbage_lock.remove(&expired); }
+
+		garbage_lock.shrink_to_fit();
+	}
 }
 
 fn derive_key_iterations(password: &str, salt: &H256, c: u32) -> (Bytes, Bytes) {
@@ -362,14 +390,12 @@ impl EncryptedHashMap<H128> for SecretStore {
 
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature="heavy-tests"))]
 mod vector_tests {
 	use super::{derive_mac,derive_key_iterations};
 	use common::*;
 
-
 	#[test]
-	#[cfg(feature="heavy-tests")]
 	fn mac_vector() {
 		let password = "testpassword";
 		let salt = H256::from_str("ae3cd4e7013836a3df6bd7241b12db061dbe2c6785853cce422d148a624ce0bd").unwrap();
@@ -395,6 +421,7 @@ mod tests {
 	use devtools::*;
 	use common::*;
 	use crypto::KeyPair;
+	use chrono::*;
 
 	#[test]
 	fn can_insert() {
@@ -581,4 +608,32 @@ mod tests {
 		let kp = KeyPair::from_secret(secret).unwrap();
 		assert_eq!(Address::from(kp.public().sha3()), addr);
 	}
+
+	#[test]
+	fn can_create_service() {
+		let temp = RandomTempPath::create_dir();
+		let svc = AccountService::new_test(&temp);
+		assert!(svc.accounts().unwrap().is_empty());
+	}
+
+	#[test]
+	fn accounts_expire() {
+		use std::collections::hash_map::*;
+
+		let temp = RandomTempPath::create_dir();
+		let svc = AccountService::new_test(&temp);
+		let address = svc.new_account("pass").unwrap();
+		svc.unlock_account(&address, "pass").unwrap();
+		assert!(svc.account_secret(&address).is_ok());
+		{
+			let ss_rw = svc.secret_store.write().unwrap();
+			let mut ua_rw = ss_rw.unlocks.write().unwrap();
+			let entry = ua_rw.entry(address);
+			if let Entry::Occupied(mut occupied) = entry { occupied.get_mut().expires = UTC::now() - Duration::minutes(1); }
+		}
+
+		svc.tick();
+
+		assert!(svc.account_secret(&address).is_err());
+	}
 }