diff --git a/drivers/serial/sunsu.c b/drivers/serial/sunsu.c
index 170d3d6..81fc269 100644
--- a/drivers/serial/sunsu.c
+++ b/drivers/serial/sunsu.c
@@ -29,6 +29,7 @@
 #include <linux/serial.h>
 #include <linux/sysrq.h>
 #include <linux/console.h>
+#include <linux/slab.h>
 #ifdef CONFIG_SERIO
 #include <linux/serio.h>
 #endif