diff --git a/sys/dev/iicbus/iic.c b/sys/dev/iicbus/iic.c
index cd33d2c557e4..d6410c7e8824 100644
--- a/sys/dev/iicbus/iic.c
+++ b/sys/dev/iicbus/iic.c
@@ -106,7 +106,7 @@ static struct cdevsw iic_cdevsw = {
 static void
 iic_identify(driver_t *driver, device_t parent)
 {
-	BUS_ADD_CHILD(parent, 0, "iic", 0);
+	BUS_ADD_CHILD(parent, 0, "iic", -1);
 }
 
 static int
diff --git a/sys/dev/iicbus/iicsmb.c b/sys/dev/iicbus/iicsmb.c
index 9bc4d869a248..966063f2a13b 100644
--- a/sys/dev/iicbus/iicsmb.c
+++ b/sys/dev/iicbus/iicsmb.c
@@ -138,7 +138,7 @@ static driver_t iicsmb_driver = {
 static void
 iicsmb_identify(driver_t *driver, device_t parent)
 {
-	BUS_ADD_CHILD(parent, 0, "iicsmb", 0);
+	BUS_ADD_CHILD(parent, 0, "iicsmb", -1);
 }
 
 static int
diff --git a/sys/dev/smbus/smb.c b/sys/dev/smbus/smb.c
index 1272c13cbc4e..b7cfff991afc 100644
--- a/sys/dev/smbus/smb.c
+++ b/sys/dev/smbus/smb.c
@@ -101,7 +101,7 @@ static struct cdevsw smb_cdevsw = {
 static void
 smb_identify(driver_t *driver, device_t parent)
 {
-	BUS_ADD_CHILD(parent, 0, "smb", 0);
+	BUS_ADD_CHILD(parent, 0, "smb", -1);
 }
 
 static int