diff --git a/include/lua/loader.hpp b/include/lua/loader.hpp
index 8836efa..fc9b7b8 100644
--- a/include/lua/loader.hpp
+++ b/include/lua/loader.hpp
@@ -2,6 +2,7 @@
 #include <lua.hpp>
 #include <vector>
 #include <string>
+#include <functional>
 
 class LuaLoader {
  public: