diff --git a/include/boost/multiprecision/detail/big_lanczos.hpp b/include/boost/multiprecision/detail/big_lanczos.hpp
index 03d3203e..0a5a154d 100644
--- a/include/boost/multiprecision/detail/big_lanczos.hpp
+++ b/include/boost/multiprecision/detail/big_lanczos.hpp
@@ -21,10 +21,10 @@ struct lanczos<multiprecision::number<Backend, ExpressionTemplates>, Policy>
 {
    typedef typename boost::math::policies::precision<multiprecision::number<Backend, ExpressionTemplates>, Policy>::type precision_type;
    typedef typename mpl::if_c<
-      precision_type::value <= 73,
+      precision_type::value && (precision_type::value <= 73),
       lanczos13UDT,
       typename mpl::if_c<
-         precision_type::value <= 122,
+      precision_type::value&& (precision_type::value <= 122),
          lanczos22UDT,
          undefined_lanczos
       >::type