diff --git a/libc/arch-mips/syscalls/sync.S b/libc/arch-mips/syscalls/sync.S
index eb788f0..d62ae76 100644
--- a/libc/arch-mips/syscalls/sync.S
+++ b/libc/arch-mips/syscalls/sync.S
@@ -2,6 +2,8 @@
 
 #include <private/bionic_asm.h>
 
+    .hidden __set_errno
+
 ENTRY(sync)
     .set noreorder
     .cpload t9