diff --git a/sys/sys/elf_common.h b/sys/sys/elf_common.h
index e17b2bfb3af..32621041cb4 100644
--- a/sys/sys/elf_common.h
+++ b/sys/sys/elf_common.h
@@ -866,6 +866,9 @@ typedef struct {
 #define	NT_ARM_SVE	0x405	/* ARM SVE registers */
 #define	NT_ARM_ADDR_MASK	0x406	/* arm64 address mask (e.g. for TBI) */
 
+/* FDO (freedesktop.org) note types. */
+#define	NT_FDO_PACKAGING_METADATA		0xcafe1a7e
+
 /* GNU note types. */
 #define	NT_GNU_ABI_TAG		1
 #define	NT_GNU_HWCAP		2