diff --git a/libgambatte/src/mem/cartridge.cpp b/libgambatte/src/mem/cartridge.cpp
index cf5c06afc1..34e6ea7408 100644
--- a/libgambatte/src/mem/cartridge.cpp
+++ b/libgambatte/src/mem/cartridge.cpp
@@ -629,7 +629,8 @@ int Cartridge::loadROM(const char *romfiledata, unsigned romfilelength, const ch
 			break;
 		}
 		
-		cgb = header[0x0143] >> 7 & (1 ^ forceDmg);
+		//cgb = header[0x0143] >> 7 & (1 ^ forceDmg);
+		cgb = forceDmg ? false : true;
 		std::printf("cgb: %d\n", cgb);
 	}