diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 213373b..2bd6a9c 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -379,7 +379,7 @@
 	struct scatterlist sg[1];
 	struct virtio_console_control cpkt;
 	struct virtqueue *vq;
-	int len;
+	unsigned int len;
 
 	if (!use_multiport(port->portdev))
 		return 0;