diff --git a/libc/libc.x86.map b/libc/libc.x86.map
index 544ee13..f13ffb0 100644
--- a/libc/libc.x86.map
+++ b/libc/libc.x86.map
@@ -1271,6 +1271,7 @@
     __pwrite_chk;
     __pwrite64_chk;
     __write_chk;
+    fileno_unlocked;
     getgrgid_r;
     getgrnam_r;
     preadv;