diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 02d84e24b7c2..f91bb416122d 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;