diff --git a/sys/kern/kern_thr.c b/sys/kern/kern_thr.c
index 75656f03c186..58c38062a6a5 100644
--- a/sys/kern/kern_thr.c
+++ b/sys/kern/kern_thr.c
@@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/systm.h>
 #include <sys/sysproto.h>
 #include <sys/signalvar.h>
+#include <sys/sysctl.h>
 #include <sys/ucontext.h>
 #include <sys/thr.h>
 #include <sys/rtprio.h>
@@ -56,6 +57,16 @@ __FBSDID("$FreeBSD$");
 
 #include <security/audit/audit.h>
 
+SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0, "thread allocation");
+
+static int max_threads_per_proc = 1500;
+SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
+	&max_threads_per_proc, 0, "Limit on threads per proc");
+
+static int max_threads_hits;
+SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
+	&max_threads_hits, 0, "");
+
 #ifdef COMPAT_FREEBSD32
 
 static inline int
@@ -74,9 +85,6 @@ suword_lwpid(void *addr, lwpid_t lwpid)
 #define suword_lwpid	suword
 #endif
 
-extern int max_threads_per_proc;
-extern int max_threads_hits;
-
 static int create_thread(struct thread *td, mcontext_t *ctx,
 			 void (*start_func)(void *), void *arg,
 			 char *stack_base, size_t stack_size,
diff --git a/sys/kern/kern_thread.c b/sys/kern/kern_thread.c
index 7161a990524a..f0e80918d70a 100644
--- a/sys/kern/kern_thread.c
+++ b/sys/kern/kern_thread.c
@@ -65,16 +65,6 @@ __FBSDID("$FreeBSD$");
  */
 static uma_zone_t thread_zone;
 
-SYSCTL_NODE(_kern, OID_AUTO, threads, CTLFLAG_RW, 0, "thread allocation");
-
-int max_threads_per_proc = 1500;
-SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_per_proc, CTLFLAG_RW,
-	&max_threads_per_proc, 0, "Limit on threads per proc");
-
-int max_threads_hits;
-SYSCTL_INT(_kern_threads, OID_AUTO, max_threads_hits, CTLFLAG_RD,
-	&max_threads_hits, 0, "");
-
 TAILQ_HEAD(, thread) zombie_threads = TAILQ_HEAD_INITIALIZER(zombie_threads);
 static struct mtx zombie_lock;
 MTX_SYSINIT(zombie_lock, &zombie_lock, "zombie lock", MTX_SPIN);