diff --git a/sys/sys/jail.h b/sys/sys/jail.h
--- a/sys/sys/jail.h
+++ b/sys/sys/jail.h
@@ -106,6 +106,8 @@
 #define	JAIL_SYS_NEW		1
 #define	JAIL_SYS_INHERIT	2
 
+#define JAIL_MAX	999999
+
 #ifndef _KERNEL
 
 struct iovec;
@@ -126,8 +128,6 @@
 #include <sys/mutex.h>
 #include <sys/_task.h>
 
-#define JAIL_MAX	999999
-
 #ifdef MALLOC_DECLARE
 MALLOC_DECLARE(M_PRISON);
 #endif