diff --git a/sys/compat/linprocfs/linprocfs.c b/sys/compat/linprocfs/linprocfs.c
--- a/sys/compat/linprocfs/linprocfs.c
+++ b/sys/compat/linprocfs/linprocfs.c
@@ -2001,16 +2001,15 @@
 static int
 linprocfs_doboot_id(PFS_FILL_ARGS)
 {
-       static bool firstboot = 1;
-       static struct uuid uuid;
-
-       if (firstboot) {
-               kern_uuidgen(&uuid, 1);
-               firstboot = 0;
-       }
-       sbuf_printf_uuid(sb, &uuid);
-       sbuf_printf(sb, "\n");
-       return(0);
+	static char boot_id[37];
+	int error = 0;
+
+	if ((error = kernel_sysctlbyname(td, "kern.random.boot_id", boot_id,
+	    &sz, 0, 0, 0, 0)) != 0) {
+		return (error);
+	}
+	sbuf_printf(sb, "%s\n", boot_id);
+	return (0);
 }
 
 /*
diff --git a/sys/dev/random/randomdev.c b/sys/dev/random/randomdev.c
--- a/sys/dev/random/randomdev.c
+++ b/sys/dev/random/randomdev.c
@@ -46,6 +46,7 @@
 #include <sys/systm.h>
 #include <sys/uio.h>
 #include <sys/unistd.h>
+#include <sys/uuid.h>
 
 #include <crypto/rijndael/rijndael-api-fst.h>
 #include <crypto/sha2/sha256.h>
@@ -86,6 +87,11 @@
 /* For use with make_dev(9)/destroy_dev(9). */
 static struct cdev *random_dev;
 
+/* UUID which differs on every boot. */
+static char boot_id[37];
+SYSCTL_STRING(_kern_random, OID_AUTO, boot_id, CTLFLAG_RDTUN, boot_id,
+    sizeof(boot_id), "UUID which differs on every boot");
+
 #if defined(RANDOM_LOADABLE)
 static void
 random_alg_context_init(void *dummy __unused)
@@ -396,6 +402,7 @@
 static int
 randomdev_modevent(module_t mod __unused, int type, void *data __unused)
 {
+	struct uuid uuid;
 	int error = 0;
 
 	switch (type) {
@@ -404,6 +411,9 @@
 		random_dev = make_dev_credf(MAKEDEV_ETERNAL_KLD, &random_cdevsw,
 		    RANDOM_UNIT, NULL, UID_ROOT, GID_WHEEL, 0644, "random");
 		make_dev_alias(random_dev, "urandom"); /* compatibility */
+
+		kern_uuidgen(&uuid, 1);
+		snprintf_uuid(boot_id, sizeof(boot_id), &uuid);
 		break;
 	case MOD_UNLOAD:
 		error = EBUSY;