diff --git a/BizHawk.Emulation/Consoles/Atari/2600/Mappers/mFA.cs b/BizHawk.Emulation/Consoles/Atari/2600/Mappers/mFA.cs
index 3ac83d5b9a..e5bfa8712b 100644
--- a/BizHawk.Emulation/Consoles/Atari/2600/Mappers/mFA.cs
+++ b/BizHawk.Emulation/Consoles/Atari/2600/Mappers/mFA.cs
@@ -40,7 +40,7 @@ namespace BizHawk.Emulation.Consoles.Atari._2600
 			Address(addr);
 			if (addr < 0x1000) 
 				base.WriteMemory(addr, value);
-			if (addr < 0x10FF) 
+			else if (addr < 0x1100) 
 				aux_ram[addr & 0xFF] = value;
 		}