diff --git a/boot/boot.c b/boot/boot.c
index b383d711f..388054421 100755
--- a/boot/boot.c
+++ b/boot/boot.c
@@ -869,8 +869,15 @@ void get_parameters(void)
 		strcat(params, ul2a(mp->size, 0x10));
 	}
 	b_setvar(E_SPECIAL|E_VAR, "memory", params);
+
+#if 0
 	b_setvar(E_SPECIAL|E_VAR, "c0",
 			DOS ? "dosfile" : get_bus() == 1 ? "at" : "bios");
+#else
+	b_setvar(E_SPECIAL|E_VAR, "label", "AT");
+	b_setvar(E_SPECIAL|E_VAR, "controller", "c0");
+#endif
+
 #if DOS
 	b_setvar(E_SPECIAL|E_VAR, "dosfile-d0", vdisk);
 #endif