diff --git a/include/winnt.h b/include/winnt.h
index c8eca8f5203..f212ddd0821 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -3265,6 +3265,7 @@ typedef struct _ACL_SIZE_INFORMATION
 #define SE_SACL_AUTO_INHERITED		0x00000800
 #define SE_DACL_PROTECTED 		0x00001000
 #define SE_SACL_PROTECTED 		0x00002000
+#define SE_RM_CONTROL_VALID		0x00004000
 #define SE_SELF_RELATIVE		0x00008000
 
 typedef DWORD SECURITY_INFORMATION, *PSECURITY_INFORMATION;