diff --git a/libc/arch-mips/syscalls/swapon.S b/libc/arch-mips/syscalls/swapon.S
index 1fe3698..ef3a537 100644
--- a/libc/arch-mips/syscalls/swapon.S
+++ b/libc/arch-mips/syscalls/swapon.S
@@ -2,6 +2,8 @@
 
 #include <private/bionic_asm.h>
 
+    .hidden __set_errno
+
 ENTRY(swapon)
     .set noreorder
     .cpload t9