diff --git a/libc/arch-x86_64/syscalls/fsync.S b/libc/arch-x86_64/syscalls/fsync.S
index 12eabd3..820502e 100644
--- a/libc/arch-x86_64/syscalls/fsync.S
+++ b/libc/arch-x86_64/syscalls/fsync.S
@@ -2,6 +2,8 @@
 
 #include <private/bionic_asm.h>
 
+    .hidden __set_errno
+
 ENTRY(fsync)
     movl    $__NR_fsync, %eax
     syscall