diff --git a/scripts/genksyms/keywords.c b/scripts/genksyms/keywords.c
index 9f40bcd17d07f5bbeb1ab2fa0793d632116ae06e..f6956aa41366885d9f2ef370a7090433a6ba81fb 100644
--- a/scripts/genksyms/keywords.c
+++ b/scripts/genksyms/keywords.c
@@ -24,6 +24,10 @@ static struct resword {
 	{ "__volatile__", VOLATILE_KEYW },
 	{ "__builtin_va_list", VA_LIST_KEYW },
 
+	{ "__int128", BUILTIN_INT_KEYW },
+	{ "__int128_t", BUILTIN_INT_KEYW },
+	{ "__uint128_t", BUILTIN_INT_KEYW },
+
 	// According to rth, c99 defines "_Bool", __restrict", __restrict__", "restrict".  KAO
 	{ "_Bool", BOOL_KEYW },
 	{ "_restrict", RESTRICT_KEYW },
diff --git a/scripts/genksyms/parse.y b/scripts/genksyms/parse.y
index 00a6d7e5497126147dc0d9a564c4a6525fff6079..1ebcf52cd0f9e0402624b748d3818c27d40384ee 100644
--- a/scripts/genksyms/parse.y
+++ b/scripts/genksyms/parse.y
@@ -76,6 +76,7 @@ static void record_compound(struct string_list **keyw,
 %token ATTRIBUTE_KEYW
 %token AUTO_KEYW
 %token BOOL_KEYW
+%token BUILTIN_INT_KEYW
 %token CHAR_KEYW
 %token CONST_KEYW
 %token DOUBLE_KEYW
@@ -263,6 +264,7 @@ simple_type_specifier:
 	| VOID_KEYW
 	| BOOL_KEYW
 	| VA_LIST_KEYW
+	| BUILTIN_INT_KEYW
 	| TYPE			{ (*$1)->tag = SYM_TYPEDEF; $$ = $1; }
 	;