diff --git a/src/include/86box/machine.h b/src/include/86box/machine.h
index 0adfab383..1d91905f9 100644
--- a/src/include/86box/machine.h
+++ b/src/include/86box/machine.h
@@ -78,7 +78,6 @@ enum {
     MACHINE_TYPE_SOCKET8,
     MACHINE_TYPE_SLOT1,
     MACHINE_TYPE_SLOT2,
-    MACHINE_TYPE_SLOT12,
     MACHINE_TYPE_SOCKET370,
     MACHINE_TYPE_MAX
 };