diff --git a/Sources/WalletConnectSign/Services/InvalidRequestsSanitiser.swift b/Sources/WalletConnectSign/Services/InvalidRequestsSanitiser.swift
index 1ffc40dd7..f68800f0e 100644
--- a/Sources/WalletConnectSign/Services/InvalidRequestsSanitiser.swift
+++ b/Sources/WalletConnectSign/Services/InvalidRequestsSanitiser.swift
@@ -1,7 +1,7 @@
 
 import Foundation
 
-class InvalidRequestsSanitiser {
+final class InvalidRequestsSanitiser {
     let historyService: HistoryServiceProtocol
     private let history: RPCHistoryProtocol