diff --git a/libc/kernel/uapi/linux/elf.h b/libc/kernel/uapi/linux/elf.h
index f9f122a..7655f12 100644
--- a/libc/kernel/uapi/linux/elf.h
+++ b/libc/kernel/uapi/linux/elf.h
@@ -360,6 +360,7 @@
 #define NT_ARM_PACA_KEYS 0x407
 #define NT_ARM_PACG_KEYS 0x408
 #define NT_ARM_TAGGED_ADDR_CTRL 0x409
+#define NT_ARM_PAC_ENABLED_KEYS 0x40a
 #define NT_ARC_V2 0x600
 #define NT_VMCOREDD 0x700
 #define NT_MIPS_DSP 0x800