diff --git a/libc/arch-x86/syscalls/gettid.S b/libc/arch-x86/syscalls/gettid.S
index c1e6ba0..5e6d65e 100644
--- a/libc/arch-x86/syscalls/gettid.S
+++ b/libc/arch-x86/syscalls/gettid.S
@@ -1,11 +1,12 @@
 /* autogenerated by gensyscalls.py */
+#include <linux/err.h>
 #include <machine/asm.h>
 #include <sys/linux-syscalls.h>
 
 ENTRY(gettid)
     movl    $__NR_gettid, %eax
     int     $0x80
-    cmpl    $-129, %eax
+    cmpl    $-MAX_ERRNO, %eax
     jb      1f
     negl    %eax
     pushl   %eax