diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index f1db395..5265330a 100644
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -23,6 +23,7 @@
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 
 #include <linux/spi/spi.h>
 #include <linux/spi/spi_bitbang.h>