diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 2783f69dada6..f8d22872d753 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -473,8 +473,8 @@ static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
 	client->bus_reset_closure = a->bus_reset_closure;
 	if (a->bus_reset != 0) {
 		fill_bus_reset_event(&bus_reset, client);
-		ret = copy_to_user(u64_to_uptr(a->bus_reset),
-				   &bus_reset, sizeof(bus_reset));
+		/* unaligned size of bus_reset is 36 bytes */
+		ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36);
 	}
 	if (ret == 0 && list_empty(&client->link))
 		list_add_tail(&client->link, &client->device->client_list);