diff --git a/libc/arch-x86_64/syscalls/fchmodat.S b/libc/arch-x86_64/syscalls/fchmodat.S
index e045a13..cee05e3 100644
--- a/libc/arch-x86_64/syscalls/fchmodat.S
+++ b/libc/arch-x86_64/syscalls/fchmodat.S
@@ -2,6 +2,8 @@
 
 #include <private/bionic_asm.h>
 
+    .hidden __set_errno
+
 ENTRY(fchmodat)
     movq    %rcx, %r10
     movl    $__NR_fchmodat, %eax