diff --git a/src/app/commands/cmd_timeline.cpp b/src/app/commands/cmd_timeline.cpp
index 982924014..f38249b4a 100644
--- a/src/app/commands/cmd_timeline.cpp
+++ b/src/app/commands/cmd_timeline.cpp
@@ -28,7 +28,8 @@ public:
 protected:
   void onLoadParams(const Params& params) override;
   void onExecute(Context* context) override;
-
+  bool onChecked(Context* ctx) override;
+  
   bool m_open;
   bool m_close;
   bool m_switch;
@@ -75,6 +76,15 @@ void TimelineCommand::onExecute(Context* context)
     App::instance()->getMainWindow()->setTimelineVisibility(newVisible);
 }
 
+bool TimelineCommand::onChecked(Context* ctx) {
+    MainWindow* mainWin = App::instance()->getMainWindow();
+    if (!mainWin)
+      return false;
+
+    Timeline* timelineWin = mainWin->getTimeline();
+    return (timelineWin && timelineWin->isVisible());
+}
+
 Command* CommandFactory::createTimelineCommand()
 {
   return new TimelineCommand;