diff --git a/drivers/spi/uniphier_spi.c b/drivers/spi/uniphier_spi.c
index 57d41b7..42ed1ba 100644
--- a/drivers/spi/uniphier_spi.c
+++ b/drivers/spi/uniphier_spi.c
@@ -11,6 +11,7 @@
 #include <time.h>
 #include <dm/device_compat.h>
 #include <linux/bitfield.h>
+#include <linux/delay.h>
 #include <linux/io.h>
 #include <spi.h>
 #include <wait_bit.h>