diff --git a/include/sdbusplus/asio/object_server.hpp b/include/sdbusplus/asio/object_server.hpp
index ac1c83a..456ba4d 100644
--- a/include/sdbusplus/asio/object_server.hpp
+++ b/include/sdbusplus/asio/object_server.hpp
@@ -242,7 +242,7 @@
     }
     template <typename T>
     std::enable_if_t<std::is_void_v<T>, void>
-        callFunction(message_t& m, InputTupleType& inputArgs)
+        callFunction(message_t&, InputTupleType& inputArgs)
     {
         std::apply(func_, inputArgs);
     }