diff --git a/include/universal/number/dd/dd.hpp b/include/universal/number/dd/dd.hpp
index 7d3c48d47..75b500063 100644
--- a/include/universal/number/dd/dd.hpp
+++ b/include/universal/number/dd/dd.hpp
@@ -57,15 +57,13 @@
 #include <universal/traits/arithmetic_traits.hpp>
 #include <universal/common/number_traits_reports.hpp>
 
-
-
 ////////////////////////////////////////////////////////////////////////////////////////
 /// INCLUDE FILES that make up the library
 #include <universal/number/dd/exceptions.hpp>
 #include <universal/number/dd/dd_fwd.hpp>
 #include <universal/number/dd/dd_impl.hpp>
-#include <universal/traits/dd_traits.hpp>
 #include <universal/number/dd/numeric_limits.hpp>
+#include <universal/traits/dd_traits.hpp>
 
 // useful functions to work with doubledoubles
 #include <universal/number/dd/manipulators.hpp>
diff --git a/include/universal/number/dd/dd_impl.hpp b/include/universal/number/dd/dd_impl.hpp
index 97fc44997..447835683 100644
--- a/include/universal/number/dd/dd_impl.hpp
+++ b/include/universal/number/dd/dd_impl.hpp
@@ -427,6 +427,7 @@ class dd {
 			(InfType == INF_TYPE_NEGATIVE ? isNegInf :
 				(InfType == INF_TYPE_POSITIVE ? isPosInf : false)));
 	}
+	BIT_CAST_CONSTEXPR bool isfinite() const noexcept { return std::isfinite(hi); }
 
 	constexpr bool sign()          const noexcept { return (hi < 0.0); }
 	constexpr int  scale()         const noexcept { return _extractExponent<std::uint64_t, double>(hi); }
@@ -1274,7 +1275,7 @@ inline dd reciprocal(const dd& a) {
 //	power functions
 
 dd cbrt(const dd& a) {
-	if (!isfinite(a) || a.iszero())
+	if (!a.isfinite() || a.iszero())
 		return a;						//	NaN returns NaN; +/-Inf returns +/-Inf, +/-0.0 returns +/-0.0
 
 	bool signA = signbit(a);