diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index 8719b36..0ba9c8b 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/cpuidle.h>
 #include <linux/sysfs.h>
+#include <linux/slab.h>
 #include <linux/cpu.h>
 
 #include "cpuidle.h"