diff --git a/drivers/staging/winbond/core.h b/drivers/staging/winbond/core.h
index d7b3aca5ddebaa71ca7ac169edefc78ef1b7e5b7..6160b2fab833fe700e5478aa0a5c2f71484e0282 100644
--- a/drivers/staging/winbond/core.h
+++ b/drivers/staging/winbond/core.h
@@ -3,6 +3,7 @@
 
 #include <linux/wireless.h>
 #include <linux/types.h>
+#include <linux/delay.h>
 
 #include "wbhal.h"
 #include "mto.h"