diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index 7a1ccde83589..a54cc3137da5 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -28,6 +28,7 @@
 #include <linux/module.h>
 #include <linux/kdev_t.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/spinlock.h>
 #include <linux/mutex.h>