diff --git a/[refs] b/[refs]
index 81eea1b338f5..d967f7777387 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 71d171847df47110fa686f60a57543aaf91be3b9
+refs/heads/master: 19f9557174d61fcfe132a6846a83c36437ff014e
diff --git a/trunk/include/linux/mfd/wm8994/core.h b/trunk/include/linux/mfd/wm8994/core.h
index d98593d52e7c..f537d2eae390 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 {