diff --git a/src/shell-app.c b/src/shell-app.c
index 7dff44106..301f01e97 100644
--- a/src/shell-app.c
+++ b/src/shell-app.c
@@ -415,6 +415,16 @@ shell_app_activate_window (ShellApp     *app,
                                                   meta_window_get_user_time (most_recent_transient)))
         window = most_recent_transient;
 
+
+      if (!shell_window_tracker_is_window_interesting (window))
+        {
+          /* We won't get notify::user-time signals for uninteresting windows,
+           * which means that an app's last_user_time won't get updated.
+           * Update it here instead.
+           */
+          app->running_state->last_user_time = timestamp;
+        }
+
       if (active != workspace)
         meta_workspace_activate_with_focus (workspace, window, timestamp);
       else