diff --git a/sys/sys/jail.h b/sys/sys/jail.h
--- a/sys/sys/jail.h
+++ b/sys/sys/jail.h
@@ -378,6 +378,8 @@
  */
 SYSCTL_DECL(_security_jail_param);
 
+#define SYSCTL_JAIL_PARAM_DECL(name)					\
+	SYSCTL_DECL(_security_jail_param_##name)
 #define	SYSCTL_JAIL_PARAM(module, param, type, fmt, descr)		\
 	SYSCTL_PROC(_security_jail_param ## module, OID_AUTO, param,	\
 	    (type) | CTLFLAG_MPSAFE, NULL, 0, sysctl_jail_param, fmt, descr)