diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 50754d2033100851b87f78d06401a3c5c137262d..d2406fe2553396a807a169ddd93b656a4876a537 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1492,8 +1492,8 @@ static int add_port(struct ports_device *portdev, u32 id)
 		 * Finally, create the debugfs file that we can use to
 		 * inspect a port's state at any time
 		 */
-		sprintf(debugfs_name, "vport%up%u",
-			port->portdev->vdev->index, id);
+		snprintf(debugfs_name, sizeof(debugfs_name), "vport%up%u",
+			 port->portdev->vdev->index, id);
 		port->debugfs_file = debugfs_create_file(debugfs_name, 0444,
 							 pdrvdata.debugfs_dir,
 							 port,