diff --git a/Lab/demo/Lab/Plugins/IO/PLY_io_plugin.cpp b/Lab/demo/Lab/Plugins/IO/PLY_io_plugin.cpp
index 63abb1e5269..a15bf05d2df 100644
--- a/Lab/demo/Lab/Plugins/IO/PLY_io_plugin.cpp
+++ b/Lab/demo/Lab/Plugins/IO/PLY_io_plugin.cpp
@@ -7,6 +7,8 @@
 #include <CGAL/Three/CGAL_Lab_io_plugin_interface.h>
 #include <CGAL/Surface_mesh/IO/PLY.h>
 #include <CGAL/Three/Three.h>
+#include <CGAL/use.h>
+#include <string>
 
 #include <QInputDialog>
 #include <QApplication>
@@ -132,8 +134,10 @@ load(QFileInfo fileinfo, bool& ok, bool add_to_scene) {
     std::vector<CGAL::IO::Color> fcolors;
     std::vector<CGAL::IO::Color> vcolors;
 
-    if (!(CGAL::IO::read_PLY (in, points, polygons, fcolors, vcolors)))
+    std::string unused_comment;
+    if (!(CGAL::IO::read_PLY (in, points, polygons, unused_comment, vcolors)))
     {
+      CGAL_USE(unused_comment);
       QApplication::restoreOverrideCursor();
       ok = false;
       return QList<Scene_item*>();