diff --git a/Surface_mesher/demo/Surface_mesher/qt4-demo/polyhedral_surface.cpp b/Surface_mesher/demo/Surface_mesher/qt4-demo/polyhedral_surface.cpp
index 3096157d99a..893cbe35620 100644
--- a/Surface_mesher/demo/Surface_mesher/qt4-demo/polyhedral_surface.cpp
+++ b/Surface_mesher/demo/Surface_mesher/qt4-demo/polyhedral_surface.cpp
@@ -256,9 +256,9 @@ void Polyhedral_surface::open(const QString& filename)
 {
   clear();
 
-  std::cerr << "Opening file \"" << filename.toLatin1().data() << "\"...";
+  std::cerr << "Opening file \"" << filename.toLocal8Bit() << "\"...";
   QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
-  std::ifstream in(filename.toLatin1().data());
+  std::ifstream in(filename.toUtf8());
   if(!in) return;
 
   if(surface_ptr)