diff --git a/libc/libc.x86_64.map b/libc/libc.x86_64.map
index 603ac86..cfa1838 100644
--- a/libc/libc.x86_64.map
+++ b/libc/libc.x86_64.map
@@ -1194,6 +1194,7 @@
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;