diff --git a/src/calibre/gui2/image_popup.py b/src/calibre/gui2/image_popup.py
index 52786782eb..c033da5b31 100644
--- a/src/calibre/gui2/image_popup.py
+++ b/src/calibre/gui2/image_popup.py
@@ -50,6 +50,7 @@ class ImageView(QDialog):
         l.setScaledContents(True)
 
         self.scrollarea = sa = QScrollArea()
+        sa.setAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
         sa.setBackgroundRole(QPalette.Dark)
         sa.setWidget(l)