diff --git a/BizHawk.Emulation.Cores/CPUs/MOS 6502X/MOS6502X.cs b/BizHawk.Emulation.Cores/CPUs/MOS 6502X/MOS6502X.cs
index b0178e64f2..be6043a861 100644
--- a/BizHawk.Emulation.Cores/CPUs/MOS 6502X/MOS6502X.cs	
+++ b/BizHawk.Emulation.Cores/CPUs/MOS 6502X/MOS6502X.cs	
@@ -54,6 +54,7 @@ namespace BizHawk.Emulation.Cores.Components.M6502
 			if (FlagI) val = val + "I";
 			if (FlagZ) val = val + "Z";
 			if (FlagC) val = val + "C";
+			if (!RDY) val = val + "R";
 			return val;
 		}