diff --git a/include/ntapi/nt_object.h b/include/ntapi/nt_object.h
index f6a97b4..0618c37 100644
--- a/include/ntapi/nt_object.h
+++ b/include/ntapi/nt_object.h
@@ -274,6 +274,30 @@ typedef struct _nt_sid {
 } nt_sid;
 
 
+typedef struct _nt_sid_os {
+	unsigned char			revision;
+	unsigned char			sub_authority_count;
+	nt_sid_identifier_authority	identifier_authority;
+	uint32_t			sub_authority[2];
+} nt_sid_os;
+
+
+typedef struct _nt_sid_user {
+	unsigned char			revision;
+	unsigned char			sub_authority_count;
+	nt_sid_identifier_authority	identifier_authority;
+	uint32_t			sub_authority[5];
+} nt_sid_user;
+
+
+typedef struct _nt_sid_any {
+	unsigned char			revision;
+	unsigned char			sub_authority_count;
+	nt_sid_identifier_authority	identifier_authority;
+	uint32_t			sub_authority[15];
+} nt_sid_any;
+
+
 typedef struct _nt_sid_and_attributes {
 	nt_sid *	sid;
 	uint32_t	attributes;