diff --git a/BizHawk.MultiClient/LuaImplementation.cs b/BizHawk.MultiClient/LuaImplementation.cs
index 9c9c566810..84e332761a 100644
--- a/BizHawk.MultiClient/LuaImplementation.cs
+++ b/BizHawk.MultiClient/LuaImplementation.cs
@@ -397,6 +397,7 @@ namespace BizHawk.MultiClient
 		                                         		"usememorydomain",
 		                                         		"getmemorydomainlist",
 		                                         		"getcurrentmemorydomain",
+																								"memory_getcurrentmemorydomainsize",
 		                                         		"read_s8",
 		                                         		"read_u8",
 		                                         		"read_s16_le",
@@ -1333,6 +1334,11 @@ namespace BizHawk.MultiClient
 			return Global.Emulator.MemoryDomains[CurrentMemoryDomain].Name;
 		}
 
+		public int memory_getcurrentmemorydomainsize()
+		{
+			return Global.Emulator.MemoryDomains[CurrentMemoryDomain].Size;
+		}
+
 		public uint memory_readbyte(object lua_addr)
 		{
 			int addr = LuaInt(lua_addr);