diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 9adc7b21903d3dc97987bbcdcd6caa7b449cecc6..e5157e39ff22aea1d0f0e05991a57bbbea77b7ac 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -15,6 +15,7 @@
 
 #include <linux/list.h>
 #include <linux/rbtree.h>
+#include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/bug.h>
 #include <linux/lockdep.h>