diff --git a/[refs] b/[refs]
index 69584eb249de..5944dce1c659 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b04edb934966b824b5d61edab76f257c10e31299
+refs/heads/master: 83051b7287e43241ccb6adaaa92615a87274898b
diff --git a/trunk/include/linux/mfd/wm8994/core.h b/trunk/include/linux/mfd/wm8994/core.h
index f44bdb7273bd..8eb1b75cb755 100644
--- a/trunk/include/linux/mfd/wm8994/core.h
+++ b/trunk/include/linux/mfd/wm8994/core.h
@@ -15,6 +15,7 @@
 #ifndef __MFD_WM8994_CORE_H__
 #define __MFD_WM8994_CORE_H__
 
+#include <linux/mutex.h>
 #include <linux/interrupt.h>
 
 enum wm8994_type {