diff --git a/panda/src/gui/config_gui.cxx b/panda/src/gui/config_gui.cxx
index 72a2fd9751..989456c3be 100644
--- a/panda/src/gui/config_gui.cxx
+++ b/panda/src/gui/config_gui.cxx
@@ -25,6 +25,7 @@ ConfigureFn(config_gui) {
   GuiRollover::init_type();
   GuiButton::init_type();
   GuiFrame::init_type();
+  GuiListBox::init_type();
 }
 
 float simple_text_margin_top =