diff --git a/Sources/M13Checkbox.swift b/Sources/M13Checkbox.swift
index 0e20060..4017eea 100644
--- a/Sources/M13Checkbox.swift
+++ b/Sources/M13Checkbox.swift
@@ -15,6 +15,7 @@ import UIKit
 
 /// A customizable checkbox control for iOS.
 @IBDesignable
+@objcMembers
 open class M13Checkbox: UIControl {
     
     //----------------------------