diff --git a/include/linux/mfd/mc13xxx.h b/include/linux/mfd/mc13xxx.h
index c17fc60..4ca8439 100644
--- a/include/linux/mfd/mc13xxx.h
+++ b/include/linux/mfd/mc13xxx.h
@@ -10,6 +10,7 @@
 #define __LINUX_MFD_MC13XXX_H

 #include <linux/interrupt.h>
+#include <linux/mutex.h>

 struct mc13xxx;