diff --git a/include/boost/text/line_break.hpp b/include/boost/text/line_break.hpp
index c22f621..3ef2109 100644
--- a/include/boost/text/line_break.hpp
+++ b/include/boost/text/line_break.hpp
@@ -2776,7 +2776,7 @@ namespace boost { namespace text { BOOST_TEXT_NAMESPACE_V1 {
         {
             template<typename T>
             using does_arithmetic =
-                decltype(-declval<T>() + declval<T>() / declval<T>() * declval<T>());
+                decltype(-std::declval<T>() + std::declval<T>() / std::declval<T>() * std::declval<T>());
 
             template<
                 typename CPIter,