diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 471dbc1e2b58e768eb36624603cb1b841f33651c..2a99d0c61b9e6699de55161c334f07bb469654e2 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -27,6 +27,7 @@
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 #include <linux/spi/spi.h>
+#include <linux/uaccess.h>
 
 #define MAX310X_NAME			"max310x"
 #define MAX310X_MAJOR			204