diff --git a/examples/run.hpp b/examples/run.hpp
index 793babe..df71449 100644
--- a/examples/run.hpp
+++ b/examples/run.hpp
@@ -26,7 +26,7 @@ concept WidgetType = std::derived_from<T, bwidgets::Widget>;
 
 template<WidgetType W>
 void run_example(
-  const std::function<void(W*, std::shared_ptr<bwidgets::Font>, int, int)>& setup,
+  const std::function<void(W*, const std::shared_ptr<bwidgets::Font>&, int, int)>& setup,
   int w = 3, int h = 3)
 {
     std::atexit(lib_exit);