diff --git a/Sources/ToastView.swift b/Sources/ToastView.swift
index 6145968..f337629 100644
--- a/Sources/ToastView.swift
+++ b/Sources/ToastView.swift
@@ -52,7 +52,9 @@ open class ToastView: UIView {
     case .pad: return 60
     case .tv: return 90
     case .carPlay: return 30
+    #if compiler(>=5.3)
     case .mac: return 60
+    #endif
     // default values
     case .unspecified: fallthrough
     @unknown default: return 30
@@ -67,7 +69,9 @@ open class ToastView: UIView {
     case .pad: return 40
     case .tv: return 60
     case .carPlay: return 20
+    #if compiler(>=5.3)
     case .mac: return 40
+    #endif
     // default values
     case .unspecified: fallthrough
     @unknown default: return 20
@@ -134,7 +138,9 @@ open class ToastView: UIView {
       case .pad: return .systemFont(ofSize: 16)
       case .tv: return .systemFont(ofSize: 20)
       case .carPlay: return .systemFont(ofSize: 12)
+      #if compiler(>=5.3)
       case .mac: return .systemFont(ofSize: 16)
+      #endif
       // default values
       case .unspecified: fallthrough
       @unknown default: return .systemFont(ofSize: 12)