diff --git a/demo/viewer/mainwindow.cpp b/demo/viewer/mainwindow.cpp
index 753b1286b..ce21cb9c7 100644
--- a/demo/viewer/mainwindow.cpp
+++ b/demo/viewer/mainwindow.cpp
@@ -107,9 +107,9 @@ MainWindow::MainWindow()
     connect(slider_, SIGNAL(valueChanged(int)), mapWidget_, SLOT(zoomToLevel(int)));
     // renderer selector
     connect(renderer_selector_,
-            SIGNAL(currentIndexChanged(QString const&)),
+            SIGNAL(currentIndexChanged(int)),
             mapWidget_,
-            SLOT(updateRenderer(QString const&)));
+            SLOT(updateRenderer(int)));
 
     // scale factor
     connect(scale_factor_, SIGNAL(valueChanged(double)), mapWidget_, SLOT(updateScaleFactor(double)));
diff --git a/demo/viewer/mapwidget.cpp b/demo/viewer/mapwidget.cpp
index 184b928c4..942c09593 100644
--- a/demo/viewer/mapwidget.cpp
+++ b/demo/viewer/mapwidget.cpp
@@ -545,15 +545,15 @@ void render_cairo(mapnik::Map const& map, double scaling_factor, QPixmap& pix)
 #endif
 }
 
-void MapWidget::updateRenderer(QString const& txt)
+void MapWidget::updateRenderer(int index)
 {
-    if (txt == "AGG")
+    std::cerr << "updateRenderer:" << index << std::endl;
+    if (index == 0)
         cur_renderer_ = AGG;
-    else if (txt == "Cairo")
+    else if (index == 1)
         cur_renderer_ = Cairo;
-    else if (txt == "Grid")
+    else if (index == 2)
         cur_renderer_ = Grid;
-    std::cerr << "Update renderer called" << std::endl;
     updateMap();
 }
 
diff --git a/demo/viewer/mapwidget.hpp b/demo/viewer/mapwidget.hpp
index 4f6748f71..292ef2e26 100644
--- a/demo/viewer/mapwidget.hpp
+++ b/demo/viewer/mapwidget.hpp
@@ -82,7 +82,7 @@ class MapWidget : public QWidget
     void zoomToLevel(int level);
     void updateMap();
     void layerSelected(int);
-    void updateRenderer(QString const& txt);
+    void updateRenderer(int);
     void updateScaleFactor(double scale_factor);
   signals:
     void mapViewChanged();