diff --git a/TPInAppReceipt/Source/Validation.swift b/TPInAppReceipt/Source/Validation.swift
index ca53741..0de7ead 100644
--- a/TPInAppReceipt/Source/Validation.swift
+++ b/TPInAppReceipt/Source/Validation.swift
@@ -10,6 +10,7 @@
 import UIKit
 #elseif os(macOS)
 import IOKit
+import Cocoa
 #endif
 
 import CommonCrypto