diff --git a/src/calibre/gui2/viewer/documentview.py b/src/calibre/gui2/viewer/documentview.py
index 0b587eeb18..e9595c3381 100644
--- a/src/calibre/gui2/viewer/documentview.py
+++ b/src/calibre/gui2/viewer/documentview.py
@@ -552,6 +552,7 @@ class DocumentView(QWebView):  # {{{
     magnification_changed = pyqtSignal(object)
     DISABLED_BRUSH = QBrush(Qt.lightGray, Qt.Dense5Pattern)
     gesture_handler = lambda s, e: False
+    last_loaded_path = None
 
     def initialize_view(self, debug_javascript=False):
         self.setRenderHints(QPainter.Antialiasing|QPainter.TextAntialiasing|QPainter.SmoothPixmapTransform)