diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 75981d0b57dccd4b6a3b5e9833557973f33d9404..580a5320cc96afd21807cddaaa40bdff47694d5d 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/err.h>
 
 struct module;
 struct device;