diff --git a/src/lib/other/pagescreen.cpp b/src/lib/other/pagescreen.cpp
index e9280fb6b..d71aed6e2 100644
--- a/src/lib/other/pagescreen.cpp
+++ b/src/lib/other/pagescreen.cpp
@@ -66,7 +66,7 @@ void PageScreen::createThumbnail()
     QSize originalSize = page->viewportSize();
     page->setViewportSize(page->mainFrame()->contentsSize());
 
-    m_pageImage = QImage(page->viewportSize(), QImage::Format_ARGB32);
+    m_pageImage = QImage(page->viewportSize(), QImage::Format_ARGB32_Premultiplied);
     QPainter painter(&m_pageImage);
     page->mainFrame()->render(&painter);
     painter.end();
diff --git a/src/lib/other/pagescreen.h b/src/lib/other/pagescreen.h
index f87c18d84..a28a23550 100644
--- a/src/lib/other/pagescreen.h
+++ b/src/lib/other/pagescreen.h
@@ -46,8 +46,6 @@ private slots:
 
     void dialogAccepted();
 
-    void buttonClicked(QAbstractButton* b);
-
 private:
     void createPixmap();
 
diff --git a/src/lib/tools/pagethumbnailer.cpp b/src/lib/tools/pagethumbnailer.cpp
index 17dfc7ce1..01ae0fcb4 100644
--- a/src/lib/tools/pagethumbnailer.cpp
+++ b/src/lib/tools/pagethumbnailer.cpp
@@ -118,7 +118,7 @@ void PageThumbnailer::createThumbnail(bool status)
 
     m_title = m_page->mainFrame()->title();
 
-    QImage image(m_page->viewportSize(), QImage::Format_ARGB32);
+    QImage image(m_page->viewportSize(), QImage::Format_ARGB32_Premultiplied);
     QPainter painter(&image);
     m_page->mainFrame()->render(&painter);
     painter.end();