diff --git a/arch/powerpc/kernel/irq_64.c b/arch/powerpc/kernel/irq_64.c
index c788c55512ed..2ab0e8d84c1d 100644
--- a/arch/powerpc/kernel/irq_64.c
+++ b/arch/powerpc/kernel/irq_64.c
@@ -354,7 +354,7 @@ EXPORT_SYMBOL(arch_local_irq_restore);
  * disabled and marked as such, so the local_irq_enable() call
  * in arch_cpu_idle() will properly re-enable everything.
  */
-bool prep_irq_for_idle(void)
+__cpuidle bool prep_irq_for_idle(void)
 {
 	/*
 	 * First we need to hard disable to ensure no interrupt