diff --git a/include/boost/random/detail/polynomial.hpp b/include/boost/random/detail/polynomial.hpp
index a8c4b269f..03e524846 100644
--- a/include/boost/random/detail/polynomial.hpp
+++ b/include/boost/random/detail/polynomial.hpp
@@ -284,6 +284,10 @@ class polynomial
     public:
         reference(digit_t &value, int idx)
             : _value(value), _idx(idx) {}
+
+        reference(const reference& other) = default;
+        reference(reference&& other) = default;
+
         operator bool() const { return (_value & (digit_t(1) << _idx)) != 0; }
         reference& operator=(bool b)
         {