diff --git a/common/db/src/parity_db.rs b/common/db/src/parity_db.rs
index 8c913468..9ae345f6 100644
--- a/common/db/src/parity_db.rs
+++ b/common/db/src/parity_db.rs
@@ -4,6 +4,7 @@ pub use ::parity_db::{Options, Db as ParityDb};
 
 use crate::*;
 
+#[must_use]
 pub struct Transaction<'a>(&'a Arc<ParityDb>, Vec<(u8, Vec<u8>, Option<Vec<u8>>)>);
 
 impl Get for Transaction<'_> {
diff --git a/common/db/src/rocks.rs b/common/db/src/rocks.rs
index 6a724563..1d42d902 100644
--- a/common/db/src/rocks.rs
+++ b/common/db/src/rocks.rs
@@ -7,6 +7,7 @@ use rocksdb::{
 
 use crate::*;
 
+#[must_use]
 pub struct Transaction<'a, T: ThreadMode>(
   RocksTransaction<'a, OptimisticTransactionDB<T>>,
   &'a OptimisticTransactionDB<T>,
diff --git a/coordinator/tributary/tendermint/src/lib.rs b/coordinator/tributary/tendermint/src/lib.rs
index 1a74083b..c676b96a 100644
--- a/coordinator/tributary/tendermint/src/lib.rs
+++ b/coordinator/tributary/tendermint/src/lib.rs
@@ -369,7 +369,7 @@ impl<N: Network + 'static> TendermintMachine<N> {
     // Clear the message tape
     {
       let mut txn = self.db.txn();
-      txn.del(&message_tape_key(self.genesis));
+      txn.del(message_tape_key(self.genesis));
       txn.commit();
     }