diff --git a/include/bits/soi-dbg.hpp b/include/bits/soi-dbg.hpp
index 6ba3cce..d8c89aa 100644
--- a/include/bits/soi-dbg.hpp
+++ b/include/bits/soi-dbg.hpp
@@ -184,7 +184,7 @@ T &&dbg_print(T &&value, std::string const& type, char const *file, int line,
 
 template <unsigned int N>
 auto dbg_print(const char (&msg)[N], std::string const &, char const *file,
-               int line, std::string const& function_name, char const *expression)
+               int line, std::string const& function_name, char const *)
     -> decltype(msg) {
   std::cerr << ANSI_DEBUG << "[" << file << ":" << line << " (" << function_name
             << ")] " << ANSI_RESET << ANSI_MESSAGE << msg << ANSI_RESET << '\n';