diff --git a/BizHawk.Emulation.Common/Interfaces/CoreComms.cs b/BizHawk.Emulation.Common/Interfaces/CoreComms.cs
index d8113525b8..ec53a23e8d 100644
--- a/BizHawk.Emulation.Common/Interfaces/CoreComms.cs
+++ b/BizHawk.Emulation.Common/Interfaces/CoreComms.cs
@@ -200,7 +200,7 @@ namespace BizHawk.Emulation.Common
 		{
 			for (int i = 0; i < _writes.Count; i++)
 			{
-				if (_writeAddrs[i] == addr)
+				if (!_writeAddrs[i].HasValue || _writeAddrs[i] == addr)
 				{
 					_writes[i]();
 				}