diff --git a/src/ha.h b/src/ha.h
index 770fdbf..465d15c 100644
--- a/src/ha.h
+++ b/src/ha.h
@@ -401,7 +401,6 @@ namespace Ha {
 
     template <class T>
     struct Builder : AbstractBuilder {
-        using factory_builder = std::function<Builder&(Builder&)>;
         T* cmp;
 
         Builder(T* cmp) : AbstractBuilder(), cmp(cmp) {}
@@ -497,7 +496,8 @@ namespace Ha {
             return factoryBuilder(*this);
         }
 
-        Builder& addPreconfigured(factory_builder factoryBuilder) {
+        template <typename Callable>
+        Builder& addPreconfigured(Callable&& factoryBuilder) {
             return factoryBuilder(*this);
         }