diff --git a/Sources/Roundrect/ButtonStyle.swift b/Sources/Roundrect/ButtonStyle.swift
index 0813af6..d96b2cd 100644
--- a/Sources/Roundrect/ButtonStyle.swift
+++ b/Sources/Roundrect/ButtonStyle.swift
@@ -39,7 +39,7 @@ public extension UIButton {
 
     var disabledColor: UIColor {
       if #available(iOS 13, *) {
-        return UIColor.quaternarySystemFill
+        return UIColor.tertiarySystemFill
       }
       return UIColor(white: 0.5, alpha: 0.5)
     }