diff --git a/drivers/scsi/ultrastor.c b/drivers/scsi/ultrastor.c
index 0571ef96..9f4b58b 100644
--- a/drivers/scsi/ultrastor.c
+++ b/drivers/scsi/ultrastor.c
@@ -138,6 +138,7 @@
 #include <linux/spinlock.h>
 #include <linux/stat.h>
 #include <linux/bitops.h>
+#include <linux/delay.h>
 
 #include <asm/io.h>
 #include <asm/system.h>