diff --git a/sys/sys/kernel.h b/sys/sys/kernel.h
index 11aa46e5a30..181036c98a6 100644
--- a/sys/sys/kernel.h
+++ b/sys/sys/kernel.h
@@ -297,6 +297,8 @@ sysinit_tslog_shim(const void * data)
 
 void	sysinit_add(struct sysinit **set, struct sysinit **set_end);
 
+#ifdef _KERNEL
+
 /*
  * Infrastructure for tunable 'constants'.  Value may be specified at compile
  * time or kernel load time.  Rules relating tunables together can be placed
@@ -459,6 +461,8 @@ struct tunable_str {
 #define	TUNABLE_STR_FETCH(path, var, size)			\
 	getenv_string((path), (var), (size))
 
+#endif /* _KERNEL */
+
 typedef void (*ich_func_t)(void *_arg);
 
 struct intr_config_hook {