diff --git a/Sources/General/KFOptionsSetter.swift b/Sources/General/KFOptionsSetter.swift
index 9a2d337b4..74d8ab8a7 100644
--- a/Sources/General/KFOptionsSetter.swift
+++ b/Sources/General/KFOptionsSetter.swift
@@ -44,7 +44,7 @@ public protocol KFOptionSetter {
 
 extension KF.Builder: KFOptionSetter { }
 
-class KFDelegateObserver: @unchecked Sendable {
+final class KFDelegateObserver: Sendable {
     static let `default` = KFDelegateObserver()
 }