diff --git a/libc/arch-mips/syscalls/wait4.S b/libc/arch-mips/syscalls/wait4.S
index ec6bd84..8f8d879 100644
--- a/libc/arch-mips/syscalls/wait4.S
+++ b/libc/arch-mips/syscalls/wait4.S
@@ -2,6 +2,8 @@
 
 #include <private/bionic_asm.h>
 
+    .hidden __set_errno
+
 ENTRY(wait4)
     .set noreorder
     .cpload t9