diff --git a/tools/libc_functions.txt b/tools/libc_functions.txt
index a6182966de87f8660bfbc77a52b5905c41d06592..5077e9abb2e5424dc2c8b1d36d32f2a74445323c 100644
--- a/tools/libc_functions.txt
+++ b/tools/libc_functions.txt
@@ -10,6 +10,8 @@ add_module
 add_name_to_object
 add_to_global
 alias_compare
+alloca
+__alloca
 __alloc_dir
 arena_get2
 argz_add_sep
@@ -39,6 +41,7 @@ bsearch
 btowc
 buffered_vfprintf
 buffer_free
+__builtin_alloca
 bzero
 cache_rpath
 call_dl_lookup