diff --git a/lib/libjail/jail.c b/lib/libjail/jail.c
index f761bc6993e..ad3348af0d2 100644
--- a/lib/libjail/jail.c
+++ b/lib/libjail/jail.c
@@ -920,13 +920,21 @@ jailparam_type(struct jailparam *jp)
 	} desc;
 	int mib[CTL_MAXNAME];
 
-	/* The "lastjid" parameter isn't real. */
+	/*
+	 * Some pseudo-parameters don't show up in the sysctl
+	 * parameter list.
+	 */
 	name = jp->jp_name;
 	if (!strcmp(name, "lastjid")) {
 		jp->jp_valuelen = sizeof(int);
 		jp->jp_ctltype = CTLTYPE_INT | CTLFLAG_WR;
 		return (0);
 	}
+	if (!strcmp(name, "desc")) {
+		jp->jp_valuelen = sizeof(int);
+		jp->jp_ctltype = CTLTYPE_INT | CTLFLAG_RW;
+		return (0);
+	}
 
 	/* Find the sysctl that describes the parameter. */
 	mib[0] = 0;
diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c
index 43035dc009b..a75ba89d2a7 100644
--- a/sys/kern/kern_jail.c
+++ b/sys/kern/kern_jail.c
@@ -4935,7 +4935,6 @@ sysctl_jail_param(SYSCTL_HANDLER_ARGS)
  * jail creation time but cannot be changed in an existing jail.
  */
 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
-SYSCTL_JAIL_PARAM(, desc, CTLTYPE_INT | CTLFLAG_RW, "I", "Jail descriptor");
 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");