diff --git a/lib/include/artichoke/Util/OverloadSet.hpp b/lib/include/artichoke/Util/OverloadSet.hpp
index 3cdcfc2..5ad8bbb 100644
--- a/lib/include/artichoke/Util/OverloadSet.hpp
+++ b/lib/include/artichoke/Util/OverloadSet.hpp
@@ -3,7 +3,7 @@
 namespace arti::lang {
 
   template <typename ...Ts>
-  struct OverloadSet {
+  struct OverloadSet : Ts... {
     using Ts::operator()...;
   };
 
diff --git a/tests/include/Utils.hpp b/tests/include/Utils.hpp
index 1f958ca..84f9d46 100644
--- a/tests/include/Utils.hpp
+++ b/tests/include/Utils.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <random>
+#include <ranges>
 
 #include <artichoke/Coroutine/Generator.hpp>