diff --git a/BizHawk.Emulation.Common/Interfaces/IDisassemblable.cs b/BizHawk.Emulation.Common/Interfaces/IDisassemblable.cs
index d3611faacd..4d53d34362 100644
--- a/BizHawk.Emulation.Common/Interfaces/IDisassemblable.cs
+++ b/BizHawk.Emulation.Common/Interfaces/IDisassemblable.cs
@@ -44,10 +44,9 @@ namespace BizHawk.Emulation.Common
 			}
 		}
 
-		public abstract IEnumerable<string> AvailableCpus
-		{
-			get;
-		}
+		public abstract IEnumerable<string> AvailableCpus { get; }
+
+		public abstract string PCRegisterName { get; }
 
 		public abstract string Disassemble(MemoryDomain m, uint addr, out int length);
 
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBA/ArmV4Disassembler.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBA/ArmV4Disassembler.cs
index af09c8ab90..2362a919e3 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBA/ArmV4Disassembler.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBA/ArmV4Disassembler.cs
@@ -16,6 +16,11 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBA
 			}
 		}
 
+		public override string PCRegisterName
+		{
+			get { return "R15"; }
+		}
+
 		public override string Disassemble(MemoryDomain m, uint addr, out int length)
 		{
 			if (_cpu == "ARM v4 (Thumb)")