--- mcs/class/System/System.Net.NetworkInformation/NetworkInterface.cs	2019-02-12 16:17:01.688315000 -0800
+++ mcs/class/System/System.Net.NetworkInformation/NetworkInterface.cs	2019-02-12 16:17:06.733612000 -0800
@@ -112,7 +112,7 @@ 
 		class MacOsNetworkInterfaceAPI : UnixNetworkInterfaceAPI
 		{
 			const int AF_INET  = 2;
-			const int AF_INET6 = 30;
+			const int AF_INET6 = 28;
 			const int AF_LINK  = 18;
 
 			public override NetworkInterface [] GetAllNetworkInterfaces ()