diff --git a/sprout/iterator/distance.hpp b/sprout/iterator/distance.hpp
index 70383652..d95ece35 100644
--- a/sprout/iterator/distance.hpp
+++ b/sprout/iterator/distance.hpp
@@ -13,6 +13,7 @@
 #include <sprout/config.hpp>
 #include <sprout/iterator/next.hpp>
 #include <sprout/iterator/type_traits/category.hpp>
+#include <sprout/type_traits/is_literal_type.hpp>
 #include <sprout/utility/pair/pair.hpp>
 #include <sprout/adl/not_found.hpp>
 
@@ -91,7 +92,7 @@ namespace sprout {
 		template<typename InputIterator>
 		inline SPROUT_CONSTEXPR typename std::enable_if<
 			!sprout::is_constant_distance_iterator<InputIterator>::value && sprout::is_input_iterator<InputIterator>::value
-				&& std::is_literal_type<InputIterator>::value,
+				&& sprout::is_literal_type<InputIterator>::value,
 			typename std::iterator_traits<InputIterator>::difference_type
 		>::type
 		iterator_distance_dispatch(InputIterator first, InputIterator last) {
@@ -101,7 +102,7 @@ namespace sprout {
 		template<typename InputIterator>
 		inline SPROUT_CONSTEXPR typename std::enable_if<
 			!sprout::is_constant_distance_iterator<InputIterator>::value && sprout::is_input_iterator<InputIterator>::value
-				&& !std::is_literal_type<InputIterator>::value,
+				&& !sprout::is_literal_type<InputIterator>::value,
 			typename std::iterator_traits<InputIterator>::difference_type
 		>::type
 		iterator_distance_dispatch(InputIterator first, InputIterator last) {
diff --git a/sprout/iterator/next.hpp b/sprout/iterator/next.hpp
index 676f2733..ef57879f 100644
--- a/sprout/iterator/next.hpp
+++ b/sprout/iterator/next.hpp
@@ -14,6 +14,7 @@
 #include <sprout/iterator/advance.hpp>
 #include <sprout/iterator/next_fwd.hpp>
 #include <sprout/iterator/prev_fwd.hpp>
+#include <sprout/type_traits/is_literal_type.hpp>
 #include <sprout/adl/not_found.hpp>
 #include <sprout/assert.hpp>
 #include <sprout/math/greater_equal.hpp>
@@ -100,7 +101,7 @@ namespace sprout {
 
 		template<typename InputIterator>
 		inline SPROUT_CONSTEXPR typename std::enable_if<
-			std::is_literal_type<InputIterator>::value,
+			sprout::is_literal_type<InputIterator>::value,
 			InputIterator
 		>::type
 		next_impl(
@@ -113,7 +114,7 @@ namespace sprout {
 		}
 		template<typename InputIterator>
 		inline SPROUT_CONSTEXPR typename std::enable_if<
-			!std::is_literal_type<InputIterator>::value,
+			!sprout::is_literal_type<InputIterator>::value,
 			InputIterator
 		>::type
 		next_impl(
diff --git a/sprout/iterator/prev.hpp b/sprout/iterator/prev.hpp
index 414b7457..42fc1ee3 100644
--- a/sprout/iterator/prev.hpp
+++ b/sprout/iterator/prev.hpp
@@ -14,6 +14,7 @@
 #include <sprout/iterator/advance.hpp>
 #include <sprout/iterator/next_fwd.hpp>
 #include <sprout/iterator/prev_fwd.hpp>
+#include <sprout/type_traits/is_literal_type.hpp>
 #include <sprout/adl/not_found.hpp>
 
 namespace sprout_adl {
@@ -73,7 +74,7 @@ namespace sprout {
 
 		template<typename BidirectionalIterator>
 		inline SPROUT_CONSTEXPR typename std::enable_if<
-			std::is_literal_type<BidirectionalIterator>::value,
+			sprout::is_literal_type<BidirectionalIterator>::value,
 			BidirectionalIterator
 		>::type
 		prev_impl(
@@ -88,7 +89,7 @@ namespace sprout {
 		}
 		template<typename BidirectionalIterator>
 		inline SPROUT_CONSTEXPR typename std::enable_if<
-			!std::is_literal_type<BidirectionalIterator>::value,
+			!sprout::is_literal_type<BidirectionalIterator>::value,
 			BidirectionalIterator
 		>::type
 		prev_impl(
diff --git a/sprout/math/issubnormal.hpp b/sprout/math/issubnormal.hpp
index 9b9c7a2d..badea999 100644
--- a/sprout/math/issubnormal.hpp
+++ b/sprout/math/issubnormal.hpp
@@ -41,7 +41,7 @@ namespace sprout {
 			typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
 		>
 		inline SPROUT_CONSTEXPR bool
-		issubnormal(FloatType x) {
+		issubnormal SPROUT_PREVENT_MACRO_SUBSTITUTION (FloatType x) {
 			return !sprout::math::isnan(x)
 				&& !sprout::math::iszero(x)
 				&& sprout::math::detail::issubnormal_or_zero(x)