diff --git a/include/boost/operators.hpp b/include/boost/operators.hpp
index b2f68b3..344bdf3 100644
--- a/include/boost/operators.hpp
+++ b/include/boost/operators.hpp
@@ -829,6 +829,8 @@ BOOST_OPERATOR_TEMPLATE1(decrementable)
 BOOST_OPERATOR_TEMPLATE2(dereferenceable)
 BOOST_OPERATOR_TEMPLATE3(indexable)
 
+BOOST_OPERATOR_TEMPLATE1(bool_testable)
+
 BOOST_OPERATOR_TEMPLATE(left_shiftable)
 BOOST_OPERATOR_TEMPLATE(right_shiftable)
 BOOST_OPERATOR_TEMPLATE(equivalent)