diff --git a/src/dmg/gbSound.cpp b/src/dmg/gbSound.cpp
index 72c85de2..9588b506 100644
--- a/src/dmg/gbSound.cpp
+++ b/src/dmg/gbSound.cpp
@@ -143,7 +143,7 @@ static void reset_apu()
 	Gb_Apu::mode_t mode = Gb_Apu::mode_dmg;
 	if ( gbHardware & 1 )
 		mode = Gb_Apu::mode_cgb;
-	if ( gbHardware & 4 )
+	if ( gbHardware & 8 )
 		mode = Gb_Apu::mode_agb;
 	gb_apu->reset( mode );