diff --git a/include/fmt/core.h b/include/fmt/core.h
index c50822a5..8ada0535 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -1690,7 +1690,11 @@ FMT_CONSTEXPR FMT_INLINE auto visit_format_arg(
   case detail::type::double_type:
     return vis(arg.value_.double_value);
   case detail::type::long_double_type:
+#if FMT_USE_FLOAT128
     return vis(arg.value_.long_double_value);
+#else
+    break;
+#endif
   case detail::type::cstring_type:
     return vis(arg.value_.string.data);
   case detail::type::string_type: