diff --git a/sys/sys/elf_common.h b/sys/sys/elf_common.h
index 6e168195e8bf..99f05496fa0a 100644
--- a/sys/sys/elf_common.h
+++ b/sys/sys/elf_common.h
@@ -753,8 +753,9 @@ typedef struct {
 #define	STB_LOCAL	0	/* Local symbol */
 #define	STB_GLOBAL	1	/* Global symbol */
 #define	STB_WEAK	2	/* like global - lower precedence */
-#define	STB_LOOS	10	/* Reserved range for operating system */
-#define	STB_HIOS	12	/*   specific semantics. */
+#define	STB_LOOS	10	/* Start of operating system reserved range. */
+#define	STB_GNU_UNIQUE	10	/* Unique symbol (GNU) */
+#define	STB_HIOS	12	/* End of operating system reserved range. */
 #define	STB_LOPROC	13	/* reserved range for processor */
 #define	STB_HIPROC	15	/*   specific semantics. */