diff --git a/sprout/tuple/default_construct.hpp b/sprout/tuple/default_construct.hpp
index 4107a35c..6c75e80e 100644
--- a/sprout/tuple/default_construct.hpp
+++ b/sprout/tuple/default_construct.hpp
@@ -19,7 +19,7 @@ namespace sprout {
 		struct default_construct_t {
 		public:
 			template<typename T>
-			operator T() const {
+			SPROUT_CONSTEXPR operator T() const {
 				return T();
 			}
 		};