diff --git a/openrouter/src/auth/auth.hpp b/openrouter/src/auth/auth.hpp
index c83f125..dbc520b 100644
--- a/openrouter/src/auth/auth.hpp
+++ b/openrouter/src/auth/auth.hpp
@@ -3,6 +3,6 @@
 
 #include <iostream>
 
-bool authenticate(const std::string token);
+bool authenticate(const std::string &token);
 
 #endif // AUTH_HPP
\ No newline at end of file