diff --git a/sys/dev/adb/adb_buttons.c b/sys/dev/adb/adb_buttons.c
index 4534f5b2a2e7..fb18435799ad 100644
--- a/sys/dev/adb/adb_buttons.c
+++ b/sys/dev/adb/adb_buttons.c
@@ -78,9 +78,7 @@ static driver_t abtn_driver = {
 	sizeof(struct abtn_softc),
 };
 
-static devclass_t abtn_devclass;
-
-DRIVER_MODULE(abtn, adb, abtn_driver, abtn_devclass, 0, 0);
+DRIVER_MODULE(abtn, adb, abtn_driver, 0, 0);
 
 static int
 abtn_probe(device_t dev)
diff --git a/sys/dev/adb/adb_kbd.c b/sys/dev/adb/adb_kbd.c
index d765e73ed351..757b687da145 100644
--- a/sys/dev/adb/adb_kbd.c
+++ b/sys/dev/adb/adb_kbd.c
@@ -111,9 +111,7 @@ static driver_t adb_kbd_driver = {
 	sizeof(struct adb_kbd_softc),
 };
 
-static devclass_t adb_kbd_devclass;
-
-DRIVER_MODULE(akbd, adb, adb_kbd_driver, adb_kbd_devclass, 0, 0);
+DRIVER_MODULE(akbd, adb, adb_kbd_driver, 0, 0);
 
 #ifdef AKBD_EMULATE_ATKBD
 
diff --git a/sys/dev/adb/adb_mouse.c b/sys/dev/adb/adb_mouse.c
index 6f6f9d633b52..7d051bb79b79 100644
--- a/sys/dev/adb/adb_mouse.c
+++ b/sys/dev/adb/adb_mouse.c
@@ -116,9 +116,7 @@ static driver_t adb_mouse_driver = {
 	sizeof(struct adb_mouse_softc),
 };
 
-static devclass_t adb_mouse_devclass;
-
-DRIVER_MODULE(ams, adb, adb_mouse_driver, adb_mouse_devclass, 0, 0);
+DRIVER_MODULE(ams, adb, adb_mouse_driver, 0, 0);
 
 static struct cdevsw ams_cdevsw = {
 	.d_version = 	D_VERSION,