diff --git a/drivers/gpio/wm8350-gpiolib.c b/drivers/gpio/wm8350-gpiolib.c
index 511840d..3599992 100644
--- a/drivers/gpio/wm8350-gpiolib.c
+++ b/drivers/gpio/wm8350-gpiolib.c
@@ -13,6 +13,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/gpio.h>
 #include <linux/mfd/core.h>