diff --git a/drivers/serial/ifx6x60.c b/drivers/serial/ifx6x60.c
index b9b7e0601961..803264aba3e3 100644
--- a/drivers/serial/ifx6x60.c
+++ b/drivers/serial/ifx6x60.c
@@ -60,6 +60,7 @@
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/spi/ifx_modem.h>
+#include <linux/delay.h>
 
 #include "ifx6x60.h"