diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 5166c65..b928bd8 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -116,6 +116,7 @@
 void smc_call(struct pt_regs *args);
 
 void __noreturn psci_system_reset(void);
+void __noreturn psci_system_off(void);
 
 #endif	/* __ASSEMBLY__ */