diff --git a/include/ntapi/nt_guid.h b/include/ntapi/nt_guid.h
index 2c27f23..d688985 100644
--- a/include/ntapi/nt_guid.h
+++ b/include/ntapi/nt_guid.h
@@ -34,4 +34,8 @@ typedef int32_t __fastcall ntapi_tt_string_to_guid_utf16(
 	__in	const nt_guid_str_utf16 *	guid_str,
 	__out	nt_guid *			guid);
 
+typedef int32_t __fastcall ntapi_tt_string_to_guid_utf8(
+	__in	const char *			guid_str,
+	__out	nt_guid *			guid);
+
 #endif
diff --git a/include/ntapi/ntapi.h b/include/ntapi/ntapi.h
index a5e91e3..63ff63f 100644
--- a/include/ntapi/ntapi.h
+++ b/include/ntapi/ntapi.h
@@ -502,6 +502,7 @@ 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_string_to_guid_utf8 *			tt_string_to_guid_utf8;
 
 	/* nt_sysinfo.h */
 	ntapi_tt_get_system_directory_native_path *	tt_get_system_directory_native_path;
diff --git a/src/guid/ntapi_tt_guid.c b/src/guid/ntapi_tt_guid.c
index 6f520fe..00628c3 100644
--- a/src/guid/ntapi_tt_guid.c
+++ b/src/guid/ntapi_tt_guid.c
@@ -192,3 +192,25 @@ int32_t __fastcall __ntapi_tt_string_to_guid_utf16(
 
 	return NT_STATUS_SUCCESS;
 }
+
+int32_t __fastcall __ntapi_tt_string_to_guid_utf8(
+	__in	const char *	guid_str,
+	__out	nt_guid *	guid)
+{
+	const char *		ch;
+	const char *		cap;
+	wchar16_t *		wch;
+	nt_guid_str_utf16	guid_str_utf16;
+
+	ch  = guid_str;
+	cap = &ch[sizeof(guid_str_utf16) / sizeof(wchar16_t)];
+	wch = &guid_str_utf16.lbrace;
+
+	for (; *ch && (ch<cap); )
+		*wch++ = *ch++;
+
+	return (ch < cap)
+		? NT_STATUS_INVALID_PARAMETER
+		: __ntapi_tt_string_to_guid_utf16(
+			&guid_str_utf16,guid);
+}
diff --git a/src/internal/ntapi.c b/src/internal/ntapi.c
index 3af78c9..1cb7dfa 100644
--- a/src/internal/ntapi.c
+++ b/src/internal/ntapi.c
@@ -326,6 +326,7 @@ 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_string_to_guid_utf8 			= __ntapi_tt_string_to_guid_utf8;
 
 	/* nt_sysinfo.h */
 	__ntapi->tt_get_system_directory_native_path 		= __ntapi_tt_get_system_directory_native_path;
diff --git a/src/internal/ntapi_fnapi.h b/src/internal/ntapi_fnapi.h
index 6bade8c..4121883 100644
--- a/src/internal/ntapi_fnapi.h
+++ b/src/internal/ntapi_fnapi.h
@@ -151,6 +151,7 @@ NTAPI_SFN(wcslen);
 /* nt_guid.h */
 NTAPI_UFN(tt_guid_to_string_utf16);
 NTAPI_UFN(tt_string_to_guid_utf16);
+NTAPI_UFN(tt_string_to_guid_utf8);
 
 /* nt_sysinfo.h */
 NTAPI_UFN(tt_get_system_directory_native_path);