diff --git a/include/asm-x86/emergency-restart.h b/include/asm-x86/emergency-restart.h
index 5418908..8e6aef1 100644
--- a/include/asm-x86/emergency-restart.h
+++ b/include/asm-x86/emergency-restart.h
@@ -4,6 +4,9 @@
 enum reboot_type {
 	BOOT_TRIPLE = 't',
 	BOOT_KBD = 'k',
+#ifdef CONFIG_X86_32
+	BOOT_BIOS = 'b',
+#endif
 	BOOT_ACPI = 'a',
 	BOOT_EFI = 'e'
 };