diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6d1b866..76be229 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -9,6 +9,7 @@
 #include <linux/seq_file.h>
 #include <linux/gpio.h>
 #include <linux/idr.h>
+#include <linux/slab.h>
 
 
 /* Optional implementation infrastructure for GPIO interfaces.