diff --git a/sys/alpha/alpha/promcons.c b/sys/alpha/alpha/promcons.c
index e95d951d6127..063d8300286b 100644
--- a/sys/alpha/alpha/promcons.c
+++ b/sys/alpha/alpha/promcons.c
@@ -266,10 +266,10 @@ CONS_DRIVER(prom, NULL, NULL, NULL, promcngetc, promcncheckc, promcnputc, NULL);
 void
 promcnattach(int alpha_console)
 {
-	cn_tab = &prom_consdev;
 	prom_consdev.cn_pri = CN_NORMAL;
 	prom_consdev.cn_dev = makedev(CDEV_MAJOR, 0);
 	make_dev(&prom_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "promcons");
+	cnadd(&prom_consdev);
 }
 
 /*
diff --git a/sys/alpha/tlsb/zs_tlsb.c b/sys/alpha/tlsb/zs_tlsb.c
index ee3dbef246a9..1e5679bcd2db 100644
--- a/sys/alpha/tlsb/zs_tlsb.c
+++ b/sys/alpha/tlsb/zs_tlsb.c
@@ -231,8 +231,8 @@ zs_cnattach(vm_offset_t base, vm_offset_t offset)
 
 	zs_consdev.cn_dev = makedev(CDEV_MAJOR, 0);
 	zs_consdev.cn_pri = CN_NORMAL;
-	cn_tab = &zs_consdev;
 	make_dev(&zs_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "zs0");
+	cnadd(&zs_consdev);
 	return (0);
 }
 
diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index fe62c70dbc8b..29f594b04e44 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -2840,7 +2840,7 @@ siocnattach(port, speed)
 	siocnopen(&sp, siocniobase, comdefaultrate);
 	splx(s);
 
-	cn_tab = &sio_consdev;
+	cnadd(&sio_consdev);
 	return (0);
 }
 
diff --git a/sys/dev/syscons/syscons.c b/sys/dev/syscons/syscons.c
index c6dd8a23ddd3..cf9e4b9a5399 100644
--- a/sys/dev/syscons/syscons.c
+++ b/sys/dev/syscons/syscons.c
@@ -1407,7 +1407,7 @@ sccnattach(void)
     sc_console_unit = unit;
     sc_console = SC_STAT(sc_get_softc(unit, SC_KERNEL_CONSOLE)->dev[0]);
     consdev.cn_dev = makedev(CDEV_MAJOR, 0);
-    cn_tab = &consdev;
+    cnadd(&consdev);
 }
 
 #endif /* __alpha__ */
diff --git a/sys/pc98/cbus/sio.c b/sys/pc98/cbus/sio.c
index 8f999b514495..cc231ddd09b3 100644
--- a/sys/pc98/cbus/sio.c
+++ b/sys/pc98/cbus/sio.c
@@ -4466,7 +4466,7 @@ siocnattach(port, speed)
 	siocnopen(&sp, siocniobase, comdefaultrate);
 	splx(s);
 
-	cn_tab = &sio_consdev;
+	cnadd(&sio_consdev);
 	return (0);
 }
 
diff --git a/sys/pc98/pc98/sio.c b/sys/pc98/pc98/sio.c
index 8f999b514495..cc231ddd09b3 100644
--- a/sys/pc98/pc98/sio.c
+++ b/sys/pc98/pc98/sio.c
@@ -4466,7 +4466,7 @@ siocnattach(port, speed)
 	siocnopen(&sp, siocniobase, comdefaultrate);
 	splx(s);
 
-	cn_tab = &sio_consdev;
+	cnadd(&sio_consdev);
 	return (0);
 }
 
diff --git a/sys/pc98/pc98/syscons.c b/sys/pc98/pc98/syscons.c
index dddaacceb829..edeac2dab34d 100644
--- a/sys/pc98/pc98/syscons.c
+++ b/sys/pc98/pc98/syscons.c
@@ -1411,7 +1411,7 @@ sccnattach(void)
     sc_console_unit = unit;
     sc_console = SC_STAT(sc_get_softc(unit, SC_KERNEL_CONSOLE)->dev[0]);
     consdev.cn_dev = makedev(CDEV_MAJOR, 0);
-    cn_tab = &consdev;
+    cnadd(&consdev);
 }
 
 #endif /* __alpha__ */