diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AxROM.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AxROM.cs
index 020baca501..28dd117a49 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AxROM.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AxROM.cs
@@ -65,6 +65,11 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 
 		public override byte ReadPRG(int addr)
 		{
+			if (Cart.prg_size ==  16)
+			{
+				return ROM[(addr & 0x3FFF) | prg << 15];
+			}
+
 			return ROM[addr | prg << 15];
 		}