diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/Gambatte.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/Gambatte.cs
index 2eed6763c6..68362f8b4c 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/Gambatte.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/Gambatte.cs
@@ -103,7 +103,19 @@ namespace BizHawk.Emulation.Cores.Nintendo.Gameboy
 
 				if (_syncSettings.EnableBIOS)
 				{
-					bios = comm.CoreFileProvider.GetFirmware(biosSystemId, biosId, true, "BIOS Not Found, Cannot Load.  Change SyncSettings to run without BIOS.");
+					try {
+						bios = comm.CoreFileProvider.GetFirmware(biosSystemId, biosId, true, "BIOS Not Found, Cannot Load.  Change SyncSettings to run without BIOS.");
+					} catch (MissingFirmwareException) {
+						if (_syncSettings.GBACGB && IsCgb) {
+							bios = comm.CoreFileProvider.GetFirmware(biosSystemId, "World", true, "BIOS Not Found, Cannot Load.  Change SyncSettings to run without BIOS.");
+							byte[] agbOverride = { 0xFF, 0x00, 0xCD, 0x03, 0x35, 0xAA, 0x31, 0x90, 0x94, 0x00, 0x00, 0x00, 0x00 };
+							for (int i = 0xF3; i < 0x100; i++) {
+								bios[i] = (byte)((agbOverride[i - 0xF3] + bios[i]) & 0xFF);
+							}
+						} else {
+							bios = comm.CoreFileProvider.GetFirmware(biosSystemId, biosId, true, "BIOS Not Found, Cannot Load.  Change SyncSettings to run without BIOS.");
+						}
+					}
 				}
 				else
 				{