diff --git a/include/sdbusplus/message/append.hpp b/include/sdbusplus/message/append.hpp
index 5dd8645..dd002a5 100644
--- a/include/sdbusplus/message/append.hpp
+++ b/include/sdbusplus/message/append.hpp
@@ -183,7 +183,7 @@
 struct append_single<details::unix_fd_type>
 {
     template <typename T>
-    static void sanitize(const T& s)
+    static void sanitize(const T&)
     {}
 
     template <typename T>