diff --git a/crates/aleph-types/src/message/base_message.rs b/crates/aleph-types/src/message/base_message.rs
index bb83811..a21ff42 100644
--- a/crates/aleph-types/src/message/base_message.rs
+++ b/crates/aleph-types/src/message/base_message.rs
@@ -12,7 +12,7 @@ use serde::de::{self, Deserializer};
 use serde::{Deserialize, Serialize};
 use std::fmt::Formatter;
 
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "UPPERCASE")]
 pub enum MessageType {
     Aggregate,