diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper078.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper078.cs
index b20fcf6641..5fe570b4e2 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper078.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper078.cs
@@ -46,6 +46,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 			ser.Sync("prg_bank_mask_16k", ref prg_bank_mask_16k);
 			ser.Sync("prg_bank_16k", ref prg_bank_16k);
 			ser.Sync("prg_banks_16k", ref prg_banks_16k);
+			ser.Sync("holydiver", ref holydiver);
 		}
 
 		void SyncPRG()