diff --git a/ethcore/src/state/account.rs b/ethcore/src/state/account.rs
index ff7d70bd3aa..5c1dd403969 100644
--- a/ethcore/src/state/account.rs
+++ b/ethcore/src/state/account.rs
@@ -460,7 +460,7 @@ impl Account {
 		self.address_hash = other.address_hash;
 		let mut cache = self.storage_cache.borrow_mut();
 		for (k, v) in other.storage_cache.into_inner() {
-			cache.insert(k.clone() , v.clone()); //TODO: cloning should not be required here
+			cache.insert(k, v);
 		}
 		self.storage_changes = other.storage_changes;
 	}