diff --git a/src/calibre/gui2/viewer/toolbars.py b/src/calibre/gui2/viewer/toolbars.py
index 0f8fe365d0..8f698a84f8 100644
--- a/src/calibre/gui2/viewer/toolbars.py
+++ b/src/calibre/gui2/viewer/toolbars.py
@@ -86,6 +86,7 @@ class ToolBar(QToolBar):
 
     def __init__(self, parent=None):
         QToolBar.__init__(self, parent)
+        self.setWindowTitle(_('Toolbar'))
         self.shortcut_actions = {}
         self.setToolButtonStyle(Qt.ToolButtonIconOnly)
         self.setVisible(False)