diff --git a/arch/arm64/kernel/smp_spin_table.c b/arch/arm64/kernel/smp_spin_table.c
index 4f93c67..4d9f10b 100644
--- a/arch/arm64/kernel/smp_spin_table.c
+++ b/arch/arm64/kernel/smp_spin_table.c
@@ -26,6 +26,7 @@
 #include <asm/cpu_ops.h>
 #include <asm/cputype.h>
 #include <asm/smp_plat.h>
+#include <asm/io.h>
 
 extern void secondary_holding_pen(void);
 volatile unsigned long secondary_holding_pen_release = INVALID_HWID;