diff --git a/BizHawk.Client.EmuHawk/Extensions/ToolExtensions.cs b/BizHawk.Client.EmuHawk/Extensions/ToolExtensions.cs
index 15e23a6d43..1ae9594e10 100644
--- a/BizHawk.Client.EmuHawk/Extensions/ToolExtensions.cs
+++ b/BizHawk.Client.EmuHawk/Extensions/ToolExtensions.cs
@@ -90,7 +90,7 @@ namespace BizHawk.Client.EmuHawk.ToolExtensions
 				var item = new ToolStripMenuItem
 				{
 					Text = name,
-					Enabled = !(maxSize.HasValue && domain.Size > maxSize.Value),
+					Enabled = !(maxSize.HasValue && domain.Size > maxSize.Value) && !(maxSize.HasValue && domain.Size == 0), // 0 denotes a full 32bit size, which is definiately greater than max size!
 					Checked = name == selected
 				};
 				item.Click += (o, ev) => setCallback(name);