1 files changed, 1 insertions, 1 deletions
diff --git a/src/designer/src/designer/doc/snippets/singleinheritance/imagedialog.h b/src/designer/src/designer/doc/snippets/singleinheritance/imagedialog.h
index aa1e11334..6fd2df0e0 100644
--- a/src/designer/src/designer/doc/snippets/singleinheritance/imagedialog.h
+++ b/src/designer/src/designer/doc/snippets/singleinheritance/imagedialog.h
@@ -11,7 +11,7 @@ class ImageDialog : public QDialog
     Q_OBJECT
 
 public:
-    ImageDialog(QWidget *parent = 0);
+    explicit ImageDialog(QWidget *parent = nullptr);
 
 private:
     Ui::ImageDialog ui;