diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index 16cee0d3c74d..8f6a82a1fd41 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -3667,8 +3667,6 @@ namespace __format
 	{ return {_Format_arg::template _S_to_enum<_Args>()...}; }
 
     public:
-      basic_format_args() noexcept = default;
-
       template<typename... _Args>
 	basic_format_args(const _Store<_Args...>& __store) noexcept;
 
diff --git a/libstdc++-v3/testsuite/std/format/arguments/args.cc b/libstdc++-v3/testsuite/std/format/arguments/args.cc
index eba129ff8944..16ca71caecbe 100644
--- a/libstdc++-v3/testsuite/std/format/arguments/args.cc
+++ b/libstdc++-v3/testsuite/std/format/arguments/args.cc
@@ -3,6 +3,10 @@
 #include <format>
 #include <testsuite_hooks.h>
 
+// LWG 4106. basic_format_args should not be default-constructible
+static_assert( ! std::is_default_constructible_v<std::format_args> );
+static_assert( ! std::is_default_constructible_v<std::wformat_args> );
+
 template<typename Ctx, typename T>
 bool equals(std::basic_format_arg<Ctx> fmt_arg, T expected) {
   return std::visit_format_arg([=](auto arg_val) {