diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 2c5410e981..9d06dbe3ef 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1293,7 +1293,7 @@ static void virtqueue_undo_map_desc(unsigned int out_num, unsigned int in_num,
 
 static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg,
                                 hwaddr *addr, unsigned int num_sg,
-                                int is_write)
+                                bool is_write)
 {
     unsigned int i;
     hwaddr len;
@@ -1317,8 +1317,9 @@ static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg,
 
 void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem)
 {
-    virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, elem->in_num, 1);
-    virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, elem->out_num, 0);
+    virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, elem->in_num, true);
+    virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, elem->out_num,
+                                                                        false);
 }
 
 static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num)