diff --git a/qutebrowser/misc/sessions.py b/qutebrowser/misc/sessions.py
index 9259f850b..d0d71f87d 100644
--- a/qutebrowser/misc/sessions.py
+++ b/qutebrowser/misc/sessions.py
@@ -221,7 +221,7 @@ class SessionManager(QObject):
         else:
             winlist = objreg.window_registry
 
-        for win_id in winlist:
+        for win_id in sorted(winlist):
             tabbed_browser = objreg.get('tabbed-browser', scope='window',
                                         window=win_id)
             main_window = objreg.get('main-window', scope='window',