diff --git a/BizHawk.Emulation.Cores/Consoles/Sega/SMS/SMS.IMemoryDomains.cs b/BizHawk.Emulation.Cores/Consoles/Sega/SMS/SMS.IMemoryDomains.cs
index ee52785580..fd5c606af8 100644
--- a/BizHawk.Emulation.Cores/Consoles/Sega/SMS/SMS.IMemoryDomains.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Sega/SMS/SMS.IMemoryDomains.cs
@@ -61,7 +61,7 @@ namespace BizHawk.Emulation.Cores.Sega.MasterSystem
 
 			if (ExtRam != null)
 			{
-				SyncByteArrayDomain("Cart (Volatile) RAM", Vdp.VRAM);
+				SyncByteArrayDomain("Cart (Volatile) RAM", ExtRam);
 			}
 		}