diff --git a/arch/hexagon/kernel/process.c b/arch/hexagon/kernel/process.c
index dd7f74ea2c20..51e37fc92857 100644
--- a/arch/hexagon/kernel/process.c
+++ b/arch/hexagon/kernel/process.c
@@ -5,6 +5,7 @@
  * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
  */
 
+#include <linux/cpu.h>
 #include <linux/sched.h>
 #include <linux/sched/debug.h>
 #include <linux/sched/task.h>