diff --git a/sys/dev/drm2/radeon/radeon_i2c.c b/sys/dev/drm2/radeon/radeon_i2c.c
index fa47638..d923aaa 100644
--- a/sys/dev/drm2/radeon/radeon_i2c.c
+++ b/sys/dev/drm2/radeon/radeon_i2c.c
@@ -1205,6 +1205,10 @@ void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
 		int ret;
 
 		mtx_lock(&Giant);
+		if (i2c->adapter != NULL &&
+		    device_get_parent(i2c->adapter) == i2c->iic_bus) {
+			device_delete_child(i2c->iic_bus, i2c->adapter);
+		}
 		ret = device_delete_child(i2c->dev->device, i2c->iic_bus);
 		mtx_unlock(&Giant);
 		KASSERT(ret == 0, ("unable to detach iic bus %s: %d",