diff --git a/libc/kernel/arch-x86/asm/siginfo.h b/libc/kernel/arch-x86/asm/siginfo.h
new file mode 100644
index 0000000..0d21d22
--- /dev/null
+++ b/libc/kernel/arch-x86/asm/siginfo.h
@@ -0,0 +1,21 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _ASM_X86_SIGINFO_H
+#define _ASM_X86_SIGINFO_H
+
+#ifdef __x86_64__
+#define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))
+#endif
+
+#include <asm-generic/siginfo.h>
+
+#endif