diff --git a/sys/kern/subr_smp.c b/sys/kern/subr_smp.c
index 03c66129120..c046c6e8967 100644
--- a/sys/kern/subr_smp.c
+++ b/sys/kern/subr_smp.c
@@ -51,7 +51,6 @@ volatile u_int started_cpus;
 void (*cpustop_restartfunc) __P((void));
 int mp_ncpus;
 
-volatile int smp_started;
 u_int all_cpus;
 
 SYSCTL_NODE(_kern, OID_AUTO, smp, CTLFLAG_RD, NULL, "Kernel SMP");
diff --git a/sys/sys/smp.h b/sys/sys/smp.h
index f887d08304d..3bb7a8084c4 100644
--- a/sys/sys/smp.h
+++ b/sys/sys/smp.h
@@ -21,7 +21,7 @@
 extern void (*cpustop_restartfunc)(void);
 extern int mp_ncpus;
 extern int smp_active;
-extern int smp_started;
+extern volatile int smp_started;
 extern int smp_cpus;
 extern u_int all_cpus;
 extern volatile u_int started_cpus;