diff --git a/libc/kernel/arch-x86/asm/setup.h b/libc/kernel/arch-x86/asm/setup.h
new file mode 100644
index 0000000..696ed97
--- /dev/null
+++ b/libc/kernel/arch-x86/asm/setup.h
@@ -0,0 +1,17 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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_SETUP_H
+#define _ASM_X86_SETUP_H
+
+#define COMMAND_LINE_SIZE 2048
+
+#endif