diff --git a/src/machine/m_at_slot1.c b/src/machine/m_at_slot1.c
index 0b57b135c..02631169e 100644
--- a/src/machine/m_at_slot1.c
+++ b/src/machine/m_at_slot1.c
@@ -177,7 +177,7 @@ static const device_config_t lx6_config[] = {
             },
             {
                 .name          = "Award Modular BIOS v4.51PG - Revision PZ (Beta)",
-                .internal_name = "lx6_beta",
+                .internal_name = "lx6_pz",
                 .bios_type     = BIOS_NORMAL, 
                 .files_no      = 1,
                 .local         = 0,