diff --git a/libc/tools/check-symbols-glibc.py b/libc/tools/check-symbols-glibc.py
index 631fd93..e40f3e3 100755
--- a/libc/tools/check-symbols-glibc.py
+++ b/libc/tools/check-symbols-glibc.py
@@ -186,14 +186,17 @@
 # being implemented (fattach).
 in_posix_and_glibc_but_actually_dead = set([
   'a64l',
+  'confstr',
   'fattach',
   'fdetach',
+  'gethostid',
   'getmsg',
   'getpmsg',
   'isastream',
   'l64a',
   'putmsg',
   'putpmsg',
+  'ulimit',
 ])
 
 posix = posix - in_posix_and_glibc_but_actually_dead