diff --git a/src/calibre/gui2/dialogs/book_info.py b/src/calibre/gui2/dialogs/book_info.py
index ded291d1bc..fdd5425678 100644
--- a/src/calibre/gui2/dialogs/book_info.py
+++ b/src/calibre/gui2/dialogs/book_info.py
@@ -166,8 +166,10 @@ class BookInfo(QDialog):
                     pixmap.height(), self.cover.size().width()-10,
                     self.cover.size().height()-10)
             if scaled:
-                pixmap = pixmap.scaled(new_width, new_height,
+                dpr = self.devicePixelRatio()
+                pixmap = pixmap.scaled(int(dpr * new_width), int(dpr * new_height),
                         Qt.KeepAspectRatio, Qt.SmoothTransformation)
+                pixmap.setDevicePixelRatio(dpr)
         self.cover.set_pixmap(pixmap)
         self.update_cover_tooltip()
 
@@ -198,6 +200,7 @@ class BookInfo(QDialog):
         self.current_row = row
         self.setWindowTitle(mi.title)
         self.cover_pixmap = QPixmap.fromImage(mi.cover_data[1])
+        self.cover_pixmap.setDevicePixelRatio(self.devicePixelRatio())
         self.resize_cover()
         html = render_html(mi, self.css, True, self, all_fields=True)
         self.details.setHtml(html)