diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c
index 56d4c14ee714..d71e9c425d5e 100644
--- a/sys/amd64/amd64/mp_machdep.c
+++ b/sys/amd64/amd64/mp_machdep.c
@@ -146,7 +146,7 @@ static void	release_aps(void *dummy);
 static int	hlt_logical_cpus;
 static u_int	hyperthreading_cpus;
 static cpumask_t	hyperthreading_cpus_mask;
-static int	hyperthreading_allowed = 1;
+static int	hyperthreading_allowed;
 static struct	sysctl_ctx_list logical_cpu_clist;
 static u_int	bootMP_size;
 
diff --git a/sys/i386/i386/mp_machdep.c b/sys/i386/i386/mp_machdep.c
index ab653d789968..479658f45871 100644
--- a/sys/i386/i386/mp_machdep.c
+++ b/sys/i386/i386/mp_machdep.c
@@ -218,7 +218,7 @@ static void	release_aps(void *dummy);
 static int	hlt_logical_cpus;
 static u_int	hyperthreading_cpus;
 static cpumask_t	hyperthreading_cpus_mask;
-static int	hyperthreading_allowed = 1;
+static int	hyperthreading_allowed;
 static struct	sysctl_ctx_list logical_cpu_clist;
 
 static void