diff --git a/shell/model/homemodel.py b/shell/model/homemodel.py
index 1455009c..1a27645a 100644
--- a/shell/model/homemodel.py
+++ b/shell/model/homemodel.py
@@ -182,7 +182,7 @@ class HomeModel(gobject.GObject):
     def _set_active_error(self, err):
         logging.error("set_active() failed: %s" % err)
 
-    def _active_window_changed_cb(self, screen):
+    def _active_window_changed_cb(self, screen, previous_window=None):
         window = screen.get_active_window()
         if window is None:
             return
diff --git a/shell/view/frame/eventarea.py b/shell/view/frame/eventarea.py
index f7012183..7365deb1 100644
--- a/shell/view/frame/eventarea.py
+++ b/shell/view/frame/eventarea.py
@@ -101,6 +101,6 @@ class EventArea(gobject.GObject):
         for window in self._windows:
             window.hide()
 
-    def _active_window_changed_cb(self, screen):
+    def _active_window_changed_cb(self, screen, previous_window=None):
         for window in self._windows:
             window.window.raise_()