diff --git a/index_theme.ts.template b/index_theme.ts.template
index 6d3ac310d..8542c9780 100644
--- a/index_theme.ts.template
+++ b/index_theme.ts.template
@@ -62,4 +62,4 @@ DefaultGuiState.state = guiState;
 // This 'leaks' the global state via the window object, useful for debugging
 // @ts-ignore
 window.mapcomplete_state = State.state;
-new DefaultGUI(State.state, guiState)
+new DefaultGUI(State.state, guiState).setup()