diff --git a/hw/gpio/max7310.c b/hw/gpio/max7310.c
index db6b5e3d76..031482d939 100644
--- a/hw/gpio/max7310.c
+++ b/hw/gpio/max7310.c
@@ -183,11 +183,10 @@ static void max7310_gpio_set(void *opaque, int line, int level)
  * but also accepts sequences that are not SMBus so return an I2C device.  */
 static void max7310_realize(DeviceState *dev, Error **errp)
 {
-    I2CSlave *i2c = I2C_SLAVE(dev);
     MAX7310State *s = MAX7310(dev);
 
-    qdev_init_gpio_in(&i2c->qdev, max7310_gpio_set, 8);
-    qdev_init_gpio_out(&i2c->qdev, s->handler, 8);
+    qdev_init_gpio_in(dev, max7310_gpio_set, ARRAY_SIZE(s->handler));
+    qdev_init_gpio_out(dev, s->handler, ARRAY_SIZE(s->handler));
 }
 
 static void max7310_class_init(ObjectClass *klass, void *data)