diff --git a/drivers/sbus/char/envctrl.c b/drivers/sbus/char/envctrl.c
index aa2b60a..c6e2eff 100644
--- a/drivers/sbus/char/envctrl.c
+++ b/drivers/sbus/char/envctrl.c
@@ -26,6 +26,7 @@
 #include <linux/miscdevice.h>
 #include <linux/kmod.h>
 #include <linux/reboot.h>
+#include <linux/slab.h>
 #include <linux/smp_lock.h>
 #include <linux/of.h>
 #include <linux/of_device.h>