diff --git a/include/boost/int128/string.hpp b/include/boost/int128/string.hpp
index b75d3332..eba64a0f 100644
--- a/include/boost/int128/string.hpp
+++ b/include/boost/int128/string.hpp
@@ -20,9 +20,9 @@ namespace int128 {
 template <typename T>
 auto to_string(const T& value) -> std::enable_if_t<(std::is_same<T, int128_t>::value || std::is_same<T, uint128_t>::value), std::string>
 {
-    char buffer[64U] {};
+    char buffer[64];
     const auto last {detail::mini_to_chars(buffer, value, 10, false)};
-    return std::string{last};
+    return std::string{last, buffer + sizeof(buffer)};
 }
 
 } // namespace int128