diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGXControlConverter.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGXControlConverter.cs
index 266b54437f..1addc3711c 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGXControlConverter.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGXControlConverter.cs
@@ -61,6 +61,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 		{
 			new CName("Lightgun Trigger", LibGPGX.INPUT_KEYS.INPUT_MENACER_TRIGGER),
 			new CName("Lightgun Start", LibGPGX.INPUT_KEYS.INPUT_MENACER_START),
+			new CName("Lightgun B", LibGPGX.INPUT_KEYS.INPUT_MENACER_B),
+			new CName("Lightgun C", LibGPGX.INPUT_KEYS.INPUT_MENACER_C),
 		};
 
 		private static readonly CName[] Activator = 
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
index 9792978c25..94e0e0b3f2 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
@@ -224,6 +224,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 			/* Menacer */
 			INPUT_MENACER_TRIGGER = 0x0040,
 			INPUT_MENACER_START = 0x0080,
+			INPUT_MENACER_B = 0x0020,
+			INPUT_MENACER_C = 0x0010,
 		}
 
 		[StructLayout(LayoutKind.Sequential)]