diff --git a/libc/libc.arm.brillo.map b/libc/libc.arm.brillo.map
index 3928cae..9ea1d8b 100644
--- a/libc/libc.arm.brillo.map
+++ b/libc/libc.arm.brillo.map
@@ -1271,6 +1271,7 @@
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;