diff --git a/drivers/power/wm831x_power.c b/drivers/power/wm831x_power.c
index f85e80b..875c4d0 100644
--- a/drivers/power/wm831x_power.c
+++ b/drivers/power/wm831x_power.c
@@ -12,6 +12,7 @@
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
+#include <linux/slab.h>
 
 #include <linux/mfd/wm831x/core.h>
 #include <linux/mfd/wm831x/auxadc.h>