diff --git a/bridges/relays/bin-substrate/src/chains/rialto_parachain_messages_to_millau.rs b/bridges/relays/bin-substrate/src/chains/rialto_parachain_messages_to_millau.rs
index bc9b8a3170..b8ff0af10f 100644
--- a/bridges/relays/bin-substrate/src/chains/rialto_parachain_messages_to_millau.rs
+++ b/bridges/relays/bin-substrate/src/chains/rialto_parachain_messages_to_millau.rs
@@ -68,7 +68,8 @@ impl SubstrateMessageLane for RialtoParachainMessagesToMillau {
 		rialto_parachain_runtime::WithMillauMessagesInstance,
 	>;
 
-	type TargetToSourceChainConversionRateUpdateBuilder = ();
+	type TargetToSourceChainConversionRateUpdateBuilder =
+		RialtoParachainMessagesToMillauUpdateConversionRateCallBuilder;
 
 	type RelayStrategy = MixStrategy;
 }