diff --git a/src/gui/previewselectdialog.h b/src/gui/previewselectdialog.h
index 969a594e0..51d5a0213 100644
--- a/src/gui/previewselectdialog.h
+++ b/src/gui/previewselectdialog.h
@@ -48,6 +48,7 @@ class PreviewListDelegate;
 class PreviewSelectDialog final : public QDialog
 {
     Q_OBJECT
+    Q_DISABLE_COPY(PreviewSelectDialog)
 
 public:
     enum PreviewColumn
diff --git a/src/gui/rss/automatedrssdownloader.h b/src/gui/rss/automatedrssdownloader.h
index d158ecee2..0c2c3768a 100644
--- a/src/gui/rss/automatedrssdownloader.h
+++ b/src/gui/rss/automatedrssdownloader.h
@@ -53,6 +53,7 @@ namespace Ui
 class AutomatedRssDownloader : public QDialog
 {
     Q_OBJECT
+    Q_DISABLE_COPY(AutomatedRssDownloader)
 
 public:
     explicit AutomatedRssDownloader(QWidget *parent = nullptr);