diff --git a/src/include/86box/machine.h b/src/include/86box/machine.h
index ad8b47638..0cd3564ee 100644
--- a/src/include/86box/machine.h
+++ b/src/include/86box/machine.h
@@ -807,6 +807,7 @@ extern int machine_at_p2bls_init(const machine_t *);
 extern int machine_at_lgibmx7g_init(const machine_t *);
 extern int machine_at_p3bf_init(const machine_t *);
 extern int machine_at_bf6_init(const machine_t *);
+extern int machine_at_bx6_init(const machine_t *);
 extern int machine_at_ax6bc_init(const machine_t *);
 extern int machine_at_atc6310bxii_init(const machine_t *);
 extern int machine_at_686bx_init(const machine_t *);