diff --git a/src/system/kernel/arch/x86/arch_cpu.c b/src/system/kernel/arch/x86/arch_cpu.c
index b8b9343682..9b848ce4e9 100644
--- a/src/system/kernel/arch/x86/arch_cpu.c
+++ b/src/system/kernel/arch/x86/arch_cpu.c
@@ -288,6 +288,8 @@ status_t
 arch_cpu_shutdown(bool _reboot)
 {
 	// ToDo: support real shutdown
+	if (!_reboot)
+		return B_NOT_SUPPORTED;
 
 	// try to reset the system using the keyboard controller
 	out8(0xfe, 0x64);