diff --git a/include/unistd.h b/include/unistd.h
index 8a01d563fe99..e4e5c62fbb67 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -519,6 +519,7 @@ int	 iruserok(unsigned long, int, const char *, const char *);
 int	 iruserok_sa(const void *, int, int, const char *, const char *);
 int	 issetugid(void);
 void	__FreeBSD_libc_enter_restricted_mode(void);
+int	 kcmp(pid_t pid1, pid_t pid2, int type, uintptr_t idx1, uintptr_t idx2);
 long	 lpathconf(const char *, int);
 #ifndef _MKDTEMP_DECLARED
 char	*mkdtemp(char *);
diff --git a/lib/libc/sys/Symbol.map b/lib/libc/sys/Symbol.map
index e9e3c7151c2f..a49229ace995 100644
--- a/lib/libc/sys/Symbol.map
+++ b/lib/libc/sys/Symbol.map
@@ -424,6 +424,10 @@ FBSD_1.7 {
 	timerfd_settime;
 };
 
+FBSD_1.8 {
+	 kcmp;
+};
+
 FBSDprivate_1.0 {
 	/* System call stubs */
 	___acl_aclcheck_fd;