diff --git a/kernel/cpu.c b/kernel/cpu.c
index e0d3a4f..2eff3f6 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -389,7 +389,7 @@
 	return error;
 }
 
-void enable_nonboot_cpus(void)
+void __ref enable_nonboot_cpus(void)
 {
 	int cpu, error;