diff --git a/src/mame/drivers/segac2.c b/src/mame/drivers/segac2.c
index 6c07073db19..5691d4c09a5 100644
--- a/src/mame/drivers/segac2.c
+++ b/src/mame/drivers/segac2.c
@@ -973,7 +973,7 @@ static INPUT_PORTS_START( sonicpop )
 	PORT_DIPNAME( 0x02, 0x00, "Trouble BGM" ) PORT_DIPLOCATION("SW2:2")
 	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0c, 0x00, "Region" ) PORT_DIPLOCATION("SW2:34")
+	PORT_DIPNAME( 0x0c, 0x00, "Region" ) PORT_DIPLOCATION("SW2:3,4")
 	PORT_DIPSETTING(    0x00, DEF_STR( USA ) )
 	PORT_DIPSETTING(    0x04, "Export" )
 	PORT_DIPSETTING(    0x08, "USA (duplicate)" )