diff --git a/src/hardware/adlib.cpp b/src/hardware/adlib.cpp
index e0b082f9..1f5eb16b 100644
--- a/src/hardware/adlib.cpp
+++ b/src/hardware/adlib.cpp
@@ -825,6 +825,9 @@ Module::Module( Section* configuration ) : Module_base(configuration) {
 	case OPL_opl3gold:
 		Init( Adlib::MODE_OPL3GOLD );
 		break;
+	case OPL_cms:
+	case OPL_none:
+		break;
 	}
 	//0x388 range
 	WriteHandler[0].Install(0x388,OPL_Write,IO_MB, 4 );