diff --git a/ethstore/src/dir/disk.rs b/ethstore/src/dir/disk.rs
index f8d8345e77f..afca0955dcf 100755
--- a/ethstore/src/dir/disk.rs
+++ b/ethstore/src/dir/disk.rs
@@ -225,7 +225,7 @@ impl<T> KeyDirectory for DiskDirectory<T> where T: KeyFileManager {
 		Some(self)
 	}
 
-	fn hash(&self) -> Result<u64, Error> { 
+	fn unique_repr(&self) -> Result<u64, Error> { 
 		self.files_hash() 
 	}
 }
diff --git a/ethstore/src/dir/geth.rs b/ethstore/src/dir/geth.rs
index 1058e433f79..0dfa2e6b23a 100755
--- a/ethstore/src/dir/geth.rs
+++ b/ethstore/src/dir/geth.rs
@@ -95,4 +95,8 @@ impl KeyDirectory for GethDirectory {
 	fn remove(&self, account: &SafeAccount) -> Result<(), Error> {
 		self.dir.remove(account)
 	}
+
+	fn unique_repr(&self) -> Result<u64, Error> {
+		self.dir.unique_repr()
+	}
 }
diff --git a/ethstore/src/dir/memory.rs b/ethstore/src/dir/memory.rs
index 941795efc2e..87d12794eb9 100644
--- a/ethstore/src/dir/memory.rs
+++ b/ethstore/src/dir/memory.rs
@@ -63,5 +63,12 @@ impl KeyDirectory for MemoryDirectory {
 		}
 		Ok(())
 	}
+
+	fn unique_repr(&self) -> Result<u64, Error> {
+		let mut val = 0u64;
+		let accounts = self.accounts.read();
+		for acc in accounts.keys() { val = val ^ ::util::FixedHash::low_u64(acc) }
+		Ok(val)
+	}
 }
 
diff --git a/ethstore/src/dir/mod.rs b/ethstore/src/dir/mod.rs
index 5fbf5fb8b15..83e97870701 100755
--- a/ethstore/src/dir/mod.rs
+++ b/ethstore/src/dir/mod.rs
@@ -62,8 +62,8 @@ pub trait KeyDirectory: Send + Sync {
 	fn path(&self) -> Option<&PathBuf> { None }
 	/// Return vault provider, if available
 	fn as_vault_provider(&self) -> Option<&VaultKeyDirectoryProvider> { None }
-	/// Returns hash of the directory content, if supported
-	fn hash(&self) -> Result<u64, Error> { Ok(0u64) }
+	/// Unique representation of directory account collection
+	fn unique_repr(&self) -> Result<u64, Error>;
 }
 
 /// Vaults provider
diff --git a/ethstore/src/dir/parity.rs b/ethstore/src/dir/parity.rs
index 198e501650f..df03260d3b0 100755
--- a/ethstore/src/dir/parity.rs
+++ b/ethstore/src/dir/parity.rs
@@ -74,4 +74,8 @@ impl KeyDirectory for ParityDirectory {
 	fn remove(&self, account: &SafeAccount) -> Result<(), Error> {
 		self.dir.remove(account)
 	}
+
+	fn unique_repr(&self) -> Result<u64, Error> {
+		self.dir.unique_repr()
+	}
 }
diff --git a/ethstore/src/ethstore.rs b/ethstore/src/ethstore.rs
index 401630ba86c..3cdf0e643cc 100755
--- a/ethstore/src/ethstore.rs
+++ b/ethstore/src/ethstore.rs
@@ -253,7 +253,7 @@ impl EthMultiStore {
 
 	fn reload_if_changed(&self) -> Result<(), Error> {
 		let mut last_dir_hash = self.dir_hash.lock();
-		let dir_hash = Some(self.dir.hash()?);
+		let dir_hash = Some(self.dir.unique_repr()?);
 		if *last_dir_hash == dir_hash {
 			return Ok(())
 		}
diff --git a/ethstore/tests/util/transient_dir.rs b/ethstore/tests/util/transient_dir.rs
index 150ae8108ef..45e2aab09d5 100755
--- a/ethstore/tests/util/transient_dir.rs
+++ b/ethstore/tests/util/transient_dir.rs
@@ -74,4 +74,8 @@ impl KeyDirectory for TransientDir {
 	fn remove(&self, account: &SafeAccount) -> Result<(), Error> {
 		self.dir.remove(account)
 	}
+
+	fn unique_repr(&self) -> Result<u64, Error> {
+		self.dir.unique_repr()
+	}
 }