diff --git a/pallet/account-migration/src/lib.rs b/pallet/account-migration/src/lib.rs
index fa3f2bee..964b8e6e 100644
--- a/pallet/account-migration/src/lib.rs
+++ b/pallet/account-migration/src/lib.rs
@@ -334,13 +334,13 @@ pub enum ExistenceReason {
 /// Build a Darwinia account migration message.
 pub fn sr25519_signable_message(spec_name: &[u8], account_id_20: &AccountId20) -> Vec<u8> {
 	[
-		b"I authorize the migration to ",
+		b"<Bytes>I authorize the migration to ",
 		array_bytes::bytes2hex("0x", account_id_20.0).as_bytes(),
 		b", an unused address on ",
 		spec_name,
 		b". Sign this message to authorize using the Substrate key associated with the account on ",
 		&spec_name[..spec_name.len() - 1],
-		b" that you wish to migrate.",
+		b" that you wish to migrate.</Bytes>",
 	]
 	.concat()
 }
diff --git a/pallet/account-migration/src/tests.rs b/pallet/account-migration/src/tests.rs
index d8eb1842..f4f03372 100644
--- a/pallet/account-migration/src/tests.rs
+++ b/pallet/account-migration/src/tests.rs
@@ -27,7 +27,7 @@ fn sr25519_signable_message_should_work() {
 		assert_eq!(
 			sr25519_signable_message(s.as_bytes(), &Default::default()),
 			format!(
-				"I authorize the migration to {}, an unused address on {}. Sign this message to authorize using the Substrate key associated with the account on {} that you wish to migrate.",
+				"<Bytes>I authorize the migration to {}, an unused address on {}. Sign this message to authorize using the Substrate key associated with the account on {} that you wish to migrate.</Bytes>",
 				"0x0000000000000000000000000000000000000000",
 				s,
 				&s[..s.len() - 1],