diff --git a/libc/tools/check-symbols-glibc.py b/libc/tools/check-symbols-glibc.py
index 31a7484..27f4df1 100755
--- a/libc/tools/check-symbols-glibc.py
+++ b/libc/tools/check-symbols-glibc.py
@@ -221,6 +221,7 @@
   'shm_open', # disallowed by SELinux
   'shm_unlink', # disallowed by SELinux
   'setutxent', # no utmp on Android
+  'sockatmark', # obsolete (https://tools.ietf.org/html/rfc6093)
   'strfmon', # icu4c
   'strfmon_l', # icu4c
   'ulimit', # obsolete