diff --git a/include/winnt.h b/include/winnt.h
index 4abae5c41be..16d13969b24 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -3212,6 +3212,7 @@ typedef enum tagSID_NAME_USE {
 #define MAXIMUM_ALLOWED            0x02000000
 #define ACCESS_SYSTEM_SECURITY     0x01000000
 
+#define EVENT_QUERY_STATE          0x0001
 #define EVENT_MODIFY_STATE         0x0002
 #define EVENT_ALL_ACCESS           (STANDARD_RIGHTS_REQUIRED|SYNCHRONIZE|0x3)