diff --git a/src/OpenMesh/Apps/Decimating/DecimaterViewerWidget.hh b/src/OpenMesh/Apps/Decimating/DecimaterViewerWidget.hh
index f5cda39f..3311521b 100644
--- a/src/OpenMesh/Apps/Decimating/DecimaterViewerWidget.hh
+++ b/src/OpenMesh/Apps/Decimating/DecimaterViewerWidget.hh
@@ -119,7 +119,7 @@ public:
 
   /// default constructor
   explicit DecimaterViewerWidget(QWidget* _parent=0)
-    : MeshViewerWidget(_parent),
+    : MeshViewerWidgetDecimaterBase(_parent),
       animate_(false),
       timer_(0),
       steps_(1)
diff --git a/src/OpenMesh/Apps/ProgViewer/ProgViewerWidget.hh b/src/OpenMesh/Apps/ProgViewer/ProgViewerWidget.hh
index cb3c8528..0ca3f9ae 100644
--- a/src/OpenMesh/Apps/ProgViewer/ProgViewerWidget.hh
+++ b/src/OpenMesh/Apps/ProgViewer/ProgViewerWidget.hh
@@ -95,7 +95,7 @@ public:
 public:   
   /// default constructor
   explicit ProgViewerWidget(QWidget* _parent=0)
-    : MeshViewerWidget(_parent),
+    : MeshViewerWidgetProgBase(_parent),
       n_base_vertices_(0),
       n_base_faces_(0),
       n_detail_vertices_(0),