diff --git a/drivers/serial/mfd.c b/drivers/serial/mfd.c
index 324c385a653d3e0dc8240b0c28c2eab560ee9382..5dff45c76d32c5f026dc1ae408166a4f5e9ac6d2 100644
--- a/drivers/serial/mfd.c
+++ b/drivers/serial/mfd.c
@@ -27,6 +27,7 @@
 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/sysrq.h>
+#include <linux/slab.h>
 #include <linux/serial_reg.h>
 #include <linux/circ_buf.h>
 #include <linux/delay.h>