diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper132.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper132.cs
index fa96a15634..52262fb360 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper132.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper132.cs
@@ -6,6 +6,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 	// specs pulled from Nintendulator sources
 	public sealed class Mapper132 : NES.NESBoardBase
 	{
+		private ByteBuffer reg = new ByteBuffer(4);
+
 		//configuraton
 		int prg_mask, chr_mask;
 		//state
@@ -33,8 +35,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			return true;
 		}
 
-		public byte[] reg = new byte [4];
-
 		public void sync()
 		{
 
@@ -89,6 +89,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			ser.Sync("chr", ref chr);
 			ser.Sync("prg", ref prg);
 			ser.Sync("is173", ref is173);
+			ser.Sync("reg", ref reg);
 		}
 
 	}