diff --git a/src/OpenMesh/Apps/Subdivider/SubdivideWidget.hh b/src/OpenMesh/Apps/Subdivider/SubdivideWidget.hh
index a22afb16..f337be77 100644
--- a/src/OpenMesh/Apps/Subdivider/SubdivideWidget.hh
+++ b/src/OpenMesh/Apps/Subdivider/SubdivideWidget.hh
@@ -88,7 +88,7 @@ public:
 public:
    
   /// constructor
-  SubdivideWidget(QWidget* _parent=0, const char* _name=0);
+  explicit SubdivideWidget(QWidget* _parent=0, const char* _name=0);
 
   /// destructor
   ~SubdivideWidget() {};