diff --git a/crates/storage/db/src/implementation/mdbx/cursor.rs b/crates/storage/db/src/implementation/mdbx/cursor.rs
index f432e76642..61214a857d 100644
--- a/crates/storage/db/src/implementation/mdbx/cursor.rs
+++ b/crates/storage/db/src/implementation/mdbx/cursor.rs
@@ -215,27 +215,26 @@ impl<K: TransactionKind, T: DupSort> DbDupCursorRO<T> for Cursor<K, T> {
     ) -> Result<DupWalker<'_, T, Self>, DatabaseError> {
         let start = match (key, subkey) {
             (Some(key), Some(subkey)) => {
-                // encode key and decode it after.
-                let key: Vec<u8> = key.encode().into();
+                let encoded_key = key.encode();
                 self.inner
-                    .get_both_range(key.as_ref(), subkey.encode().as_ref())
+                    .get_both_range(encoded_key.as_ref(), subkey.encode().as_ref())
                     .map_err(|e| DatabaseError::Read(e.into()))?
-                    .map(|val| decoder::<T>((Cow::Owned(key), val)))
+                    .map(|val| decoder::<T>((Cow::Borrowed(encoded_key.as_ref()), val)))
             }
             (Some(key), None) => {
-                let key: Vec<u8> = key.encode().into();
+                let encoded_key = key.encode();
                 self.inner
-                    .set(key.as_ref())
+                    .set(encoded_key.as_ref())
                     .map_err(|e| DatabaseError::Read(e.into()))?
-                    .map(|val| decoder::<T>((Cow::Owned(key), val)))
+                    .map(|val| decoder::<T>((Cow::Borrowed(encoded_key.as_ref()), val)))
             }
             (None, Some(subkey)) => {
                 if let Some((key, _)) = self.first()? {
-                    let key: Vec<u8> = key.encode().into();
+                    let encoded_key = key.encode();
                     self.inner
-                        .get_both_range(key.as_ref(), subkey.encode().as_ref())
+                        .get_both_range(encoded_key.as_ref(), subkey.encode().as_ref())
                         .map_err(|e| DatabaseError::Read(e.into()))?
-                        .map(|val| decoder::<T>((Cow::Owned(key), val)))
+                        .map(|val| decoder::<T>((Cow::Borrowed(encoded_key.as_ref()), val)))
                 } else {
                     Some(Err(DatabaseError::Read(MDBXError::NotFound.into())))
                 }