diff --git a/src/OpenMesh/Apps/VDProgMesh/Synthesizer/VDPMSynthesizerViewerWidget.cc b/src/OpenMesh/Apps/VDProgMesh/Synthesizer/VDPMSynthesizerViewerWidget.cc
index fcc110be..b301f582 100644
--- a/src/OpenMesh/Apps/VDProgMesh/Synthesizer/VDPMSynthesizerViewerWidget.cc
+++ b/src/OpenMesh/Apps/VDProgMesh/Synthesizer/VDPMSynthesizerViewerWidget.cc
@@ -82,7 +82,16 @@ namespace OpenMesh {
 
 //== IMPLEMENTATION ========================================================== 
 
+VDPMSynthesizerViewerWidget::VDPMSynthesizerViewerWidget(QWidget* _parent, const char* _name)
+  : MeshViewerWidget(_parent)
+{
+  adaptive_mode_ = true;
+}
 
+VDPMSynthesizerViewerWidget::~VDPMSynthesizerViewerWidget()
+{
+
+}
 
 void
 VDPMSynthesizerViewerWidget::
diff --git a/src/OpenMesh/Apps/VDProgMesh/Synthesizer/VDPMSynthesizerViewerWidget.hh b/src/OpenMesh/Apps/VDProgMesh/Synthesizer/VDPMSynthesizerViewerWidget.hh
index f1e1e56c..b131f070 100644
--- a/src/OpenMesh/Apps/VDProgMesh/Synthesizer/VDPMSynthesizerViewerWidget.hh
+++ b/src/OpenMesh/Apps/VDProgMesh/Synthesizer/VDPMSynthesizerViewerWidget.hh
@@ -113,16 +113,9 @@ public:
 
 public:
 
-  VDPMSynthesizerViewerWidget(QWidget* _parent=0, const char* _name=0)
-    : MeshViewerWidget(_parent)
-  {
-    adaptive_mode_ = true;
-  }
+  VDPMSynthesizerViewerWidget(QWidget* _parent=0, const char* _name=0);
 
-  ~VDPMSynthesizerViewerWidget()
-  {
-
-  }
+  ~VDPMSynthesizerViewerWidget();
 
   /// open view-dependent progressive mesh
   void open_vd_prog_mesh(const char* _filename);