diff --git a/subdividerToolbar.hh b/subdividerToolbar.hh
index e0b8a86f76eec942a0493f826318a7f5a17436ef..0c4c27caa878ddc474d95a3801c614545d676f8e 100644
--- a/subdividerToolbar.hh
+++ b/subdividerToolbar.hh
@@ -61,6 +61,6 @@ class subdividerToolbarWidget : public QWidget, public Ui::SubdividerControls
   Q_OBJECT
 
   public:
-    subdividerToolbarWidget(QWidget *parent = 0);
+    explicit subdividerToolbarWidget(QWidget *parent = 0);
 };