diff --git a/ethstore/tests/util/transient_dir.rs b/ethstore/tests/util/transient_dir.rs
index f4998e1241d..23523e48c88 100644
--- a/ethstore/tests/util/transient_dir.rs
+++ b/ethstore/tests/util/transient_dir.rs
@@ -64,7 +64,7 @@ impl KeyDirectory for TransientDir {
 		self.dir.load()
 	}
 
-	fn insert(&self, account: SafeAccount) -> Result<(), Error> {
+	fn insert(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
 		self.dir.insert(account)
 	}