diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 10c2f3d7a4a24ddd9402288bdef41aba8b63dc30..973d0c2228030b7b45bff2abffb0076df8ed50b4 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -416,7 +416,7 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
         unsigned int max, num_bufs, indirect = 0;
         VRingDesc desc;
         hwaddr desc_pa;
-        int i;
+        unsigned int i;
 
         max = vq->vring.num;
         num_bufs = total_bufs;