diff --git a/include/rfl/internal/is_attribute.hpp b/include/rfl/internal/is_attribute.hpp
index ae014505..bdddaf75 100644
--- a/include/rfl/internal/is_attribute.hpp
+++ b/include/rfl/internal/is_attribute.hpp
@@ -8,6 +8,9 @@
 #include "../Field.hpp"
 
 namespace rfl {
+
+template <class T> struct Attribute;
+
 namespace internal {
 
 template <class T>
diff --git a/include/rfl/parsing/NamedTupleParser.hpp b/include/rfl/parsing/NamedTupleParser.hpp
index b2f5166d..0af5607a 100644
--- a/include/rfl/parsing/NamedTupleParser.hpp
+++ b/include/rfl/parsing/NamedTupleParser.hpp
@@ -8,6 +8,7 @@
 #include "../NamedTuple.hpp"
 #include "../Result.hpp"
 #include "../always_false.hpp"
+#include "../internal/Memoization.hpp"
 #include "../internal/is_basic_type.hpp"
 #include "../internal/strings/replace_all.hpp"
 #include "is_required.hpp"