diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.cs
index 300fd7ab94..4426560a09 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.cs
@@ -311,6 +311,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 			for (var i = 0; i < LibGPGX.CD_MAX_TRACKS; i++)
 			{
 				ret.tracks[i].fd = IntPtr.Zero;
+				ret.tracks[i].offset = 0;
 				ret.tracks[i].loopEnabled = 0;
 				ret.tracks[i].loopOffset = 0;
 
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
index cd8f12744f..106c915083 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
@@ -283,6 +283,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 		public struct CDTrack
 		{
 			public IntPtr fd;
+			public int offset;
 			public int start;
 			public int end;
 			public int mode;