diff --git a/include/ntapi/nt_guid.h b/include/ntapi/nt_guid.h
index d688985..bae1468 100644
--- a/include/ntapi/nt_guid.h
+++ b/include/ntapi/nt_guid.h
@@ -18,6 +18,21 @@ typedef struct _nt_guid_str_utf16 {
 	wchar16_t	rbrace;
 } nt_guid_str_utf16, nt_uuid_str_utf16;
 
+typedef struct _nt_guid_str_utf8 {
+	uint8_t		lbrace;
+	uint8_t		group1[8];
+	uint8_t		dash1;
+	uint8_t		group2[4];
+	uint8_t		dash2;
+	uint8_t		group3[4];
+	uint8_t		dash3;
+	uint8_t		group4[4];
+	uint8_t		dash4;
+	uint8_t		group5[12];
+	uint8_t		rbrace;
+	uint8_t		null;
+} nt_guid_str_utf8, nt_uuid_str_utf8;
+
 typedef void __fastcall ntapi_tt_guid_copy(
 	__out	nt_guid *	pguid_dst,
 	__in	const nt_guid *	pguid_src);
@@ -34,6 +49,10 @@ typedef int32_t __fastcall ntapi_tt_string_to_guid_utf16(
 	__in	const nt_guid_str_utf16 *	guid_str,
 	__out	nt_guid *			guid);
 
+typedef void __fastcall ntapi_tt_guid_to_string_utf8(
+	__in	const nt_guid *		guid,
+	__out	nt_guid_str_utf8 *	guid_str);
+
 typedef int32_t __fastcall ntapi_tt_string_to_guid_utf8(
 	__in	const char *			guid_str,
 	__out	nt_guid *			guid);
diff --git a/include/ntapi/ntapi.h b/include/ntapi/ntapi.h
index 71d8ffb..9fcb896 100644
--- a/include/ntapi/ntapi.h
+++ b/include/ntapi/ntapi.h
@@ -509,6 +509,7 @@ typedef struct _ntapi_vtbl {
 	ntapi_tt_guid_compare *				tt_guid_compare;
 	ntapi_tt_guid_to_string_utf16 *			tt_guid_to_string_utf16;
 	ntapi_tt_string_to_guid_utf16 *			tt_string_to_guid_utf16;
+	ntapi_tt_guid_to_string_utf8 *			tt_guid_to_string_utf8;
 	ntapi_tt_string_to_guid_utf8 *			tt_string_to_guid_utf8;
 
 	/* nt_sysinfo.h */
diff --git a/src/guid/ntapi_tt_guid.c b/src/guid/ntapi_tt_guid.c
index 00628c3..6e8c7c4 100644
--- a/src/guid/ntapi_tt_guid.c
+++ b/src/guid/ntapi_tt_guid.c
@@ -214,3 +214,57 @@ int32_t __fastcall __ntapi_tt_string_to_guid_utf8(
 		: __ntapi_tt_string_to_guid_utf16(
 			&guid_str_utf16,guid);
 }
+
+void __fastcall __ntapi_tt_guid_to_string_utf8(
+	__in	const nt_guid *		guid,
+	__out	nt_guid_str_utf8 *	guid_str)
+{
+	uint16_t	key;
+	uint8_t *	ch;
+
+	ch = &(guid_str->group5[0]);
+
+	__ntapi_tt_uint32_to_hex_utf8(
+		guid->data1,
+		&guid_str->group1[0]);
+
+	__ntapi_tt_uint16_to_hex_utf8(
+		guid->data2,
+		&guid_str->group2[0]);
+
+	__ntapi_tt_uint16_to_hex_utf8(
+		guid->data3,
+		&guid_str->group3[0]);
+
+	key = guid->data4[0] * 0x100 + guid->data4[1];
+
+	__ntapi_tt_uint16_to_hex_utf8(
+		key,
+		&guid_str->group4[0]);
+
+	key = guid->data4[2] * 0x100 + guid->data4[3];
+
+	__ntapi_tt_uint16_to_hex_utf8(
+		key,
+		&guid_str->group5[0]);
+
+	key = guid->data4[4] * 0x100 + guid->data4[5];
+
+	__ntapi_tt_uint16_to_hex_utf8(
+		key,
+		&(ch[4]));
+
+	key = guid->data4[6] * 0x100 + guid->data4[7];
+
+	__ntapi_tt_uint16_to_hex_utf8(
+		key,
+		&(ch[8]));
+
+	guid_str->lbrace = '{';
+	guid_str->rbrace = '}';
+	guid_str->dash1 = '-';
+	guid_str->dash2 = '-';
+	guid_str->dash3 = '-';
+	guid_str->dash4 = '-';
+	guid_str->null  = 0;
+}
diff --git a/src/internal/ntapi.c b/src/internal/ntapi.c
index 7562b35..db1c92a 100644
--- a/src/internal/ntapi.c
+++ b/src/internal/ntapi.c
@@ -333,6 +333,7 @@ static int32_t __fastcall __ntapi_init_once(ntapi_vtbl ** pvtbl)
 	__ntapi->tt_guid_compare 				= __ntapi_tt_guid_compare;
 	__ntapi->tt_guid_to_string_utf16 			= __ntapi_tt_guid_to_string_utf16;
 	__ntapi->tt_string_to_guid_utf16 			= __ntapi_tt_string_to_guid_utf16;
+	__ntapi->tt_guid_to_string_utf8				= __ntapi_tt_guid_to_string_utf8;
 	__ntapi->tt_string_to_guid_utf8 			= __ntapi_tt_string_to_guid_utf8;
 
 	/* nt_sysinfo.h */
diff --git a/src/internal/ntapi_fnapi.h b/src/internal/ntapi_fnapi.h
index ca888c4..6128488 100644
--- a/src/internal/ntapi_fnapi.h
+++ b/src/internal/ntapi_fnapi.h
@@ -329,6 +329,8 @@ NTAPI_UFN(tt_guid_copy);
 NTAPI_UFN(tt_guid_compare);
 NTAPI_UFN(tt_guid_to_string_utf16);
 NTAPI_UFN(tt_string_to_guid_utf16);
+NTAPI_UFN(tt_guid_to_string_utf8);
+NTAPI_UFN(tt_string_to_guid_utf8);
 
 /* log */
 NTAPI_UFN(log_write);