diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.Core.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.Core.cs
index 54a678e2fd..cfa279c862 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.Core.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.Core.cs
@@ -1149,6 +1149,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				uint flags = (uint)(MemoryCallbackFlags.CPUZero | MemoryCallbackFlags.AccessWrite | MemoryCallbackFlags.SizeByte);
 				MemoryCallbacks.CallMemoryCallbacks(addr, value, flags, "System Bus");
 			}
+
+			DB = value;
 		}
 
 		// the palette for each VS game needs to be chosen explicitly since there are 6 different ones.