diff --git a/src/include/86box/machine.h b/src/include/86box/machine.h
index 7ad34226c..ad2b8d41c 100644
--- a/src/include/86box/machine.h
+++ b/src/include/86box/machine.h
@@ -317,6 +317,7 @@ extern int	machine_at_s1668_init(const machine_t *);
 /* m_at_slot1.c */
 extern int	machine_at_6bxc_init(const machine_t *);
 extern int  machine_at_p2bls_init(const machine_t *);
+extern int	machine_at_bf6_init(const machine_t *);
 extern int	machine_at_borapro_init(const machine_t *);
 
 /* m_at_socket370.c */