diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index fb0d74da0776e2803db3a5c7af78a0a3c7c60f5b..f208c6ddb93488e809bd88d7fac4f8107f9bd6e1 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -96,7 +96,7 @@ static void virtio_blk_rw_complete(void *opaque, int ret)
         trace_virtio_blk_rw_complete(vdev, req, ret);
 
         if (req->qiov.nalloc != -1) {
-            /* If nalloc is != 1 req->qiov is a local copy of the original
+            /* If nalloc is != -1 req->qiov is a local copy of the original
              * external iovec. It was allocated in submit_requests to be
              * able to merge requests. */
             qemu_iovec_destroy(&req->qiov);