diff --git a/aegisub/src/video_box.cpp b/aegisub/src/video_box.cpp
index 0f329d9a1..5ddff3b8d 100644
--- a/aegisub/src/video_box.cpp
+++ b/aegisub/src/video_box.cpp
@@ -159,6 +159,8 @@ VideoBox::VideoBox(wxWindow *parent, bool isDetached, agi::Context *context)
 		VideoSizer->AddStretchSpacer(1);
 	SetSizer(VideoSizer);
 
+	UpdateTimeBoxes();
+
 	Bind(wxEVT_COMMAND_BUTTON_CLICKED, &VideoBox::OnButton, this);
 	Bind(wxEVT_COMMAND_TOGGLEBUTTON_CLICKED, &VideoBox::OnButton, this);